Hydrologic cycle - Revision history

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For Further Reading

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	<onlyinclude>The '''hydrologic cycle''', also known as the '''water cycle''' is a way of describing the [[material flow]] of water throughout the [[Earth]]. This series of steps describes how [[water]] moves across the Earth and changes form. These specific steps result in the circulation of water between [[ocean]]s, the [[atmosphere]], and the land. The water cycle involves natural phenomena that include [[precipitation]] such as [[rain]] and [[snow]], drainage from rivers, and the return of water to the atmosphere through [[evaporation]] and [[transpiration]].</onlyinclude><ref name=usgs>USGS Water School. (August 31, 2015). ''The Water Cycle Summary'' [Online]. Available: http://water.usgs.gov/edu/watercyclesummary.html</ref> This natural cycling of water through a variety of different locations on the Earth means that through the history of the Earth, the amount of water has been relatively constant. Little has been added or lost over the years, and this water has been continuously in motion.<ref name="RE1">Environment Canada. (August 20, 2015). ''The Hydrologic Cycle'' [Online]. Available: https://www.ec.gc.ca/eau-water/default.asp?lang=En&n=23CEC266-1</ref>		<onlyinclude>The '''hydrologic cycle''', also known as the '''water cycle''' is a way of describing the [[material flow]] of water throughout the [[Earth]]. This series of steps describes how [[water]] moves across the Earth and changes form. These specific steps result in the circulation of water between [[ocean]]s, the [[atmosphere]], and the land. The water cycle involves natural phenomena that include [[precipitation]] such as [[rain]] and [[snow]], drainage from rivers, and the return of water to the atmosphere through [[evaporation]] and [[transpiration]].</onlyinclude><ref name=usgs>USGS Water School. (August 31, 2015). ''The Water Cycle Summary'' [Online]. Available: http://water.usgs.gov/edu/watercyclesummary.html</ref> This natural cycling of water through a variety of different locations on the Earth means that through the history of the Earth, the amount of water has been relatively constant. Little has been added or lost over the years, and this water has been continuously in motion.<ref name="RE1">Environment Canada. (August 20, 2015). ''The Hydrologic Cycle'' [Online]. Available: https://www.ec.gc.ca/eau-water/default.asp?lang=En&n=23CEC266-1</ref>

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	For more information please see [[Groundwater as a part of the hydrologic cycle]].		For more information please see [[Groundwater as a part of the hydrologic cycle]].

			==For Further Reading==
			*[[Groundwater]]
			*[[Evaporation]]
			*[[Transpiration]]
			*[[Precipitation]]
			*Or explore a [[Special:Random\|random page]]

	==References==		==References==
	{{reflist}}[[Category:Uploaded]]		{{reflist}}[[Category:Uploaded]]

Jmdonev: 1 revision imported

2017-08-29T01:47:17Z

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Jmdonev at 17:52, 28 July 2017

2017-07-28T17:52:04Z

← Older revision		Revision as of 17:52, 28 July 2017
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	<onlyinclude>The '''hydrologic cycle''', also known as the '''water cycle''' is a way of describing the [[material flow]] of water throughout the [[Earth]]. This series of steps describes how [[water]] moves across the Earth and changes form. These specific steps result in the circulation of water between [[ocean]]s, the [[atmosphere]], and the land. The water cycle involves natural phenomena that include [[precipitation]] such as [[rain]] and [[snow]], drainage from rivers, and the return of water to the atmosphere through [[evaporation]] and [[transpiration]].</onlyinclude><ref name=usgs>USGS Water School. (August 31, 2015). ''The Water Cycle Summary'' [Online]. Available: http://water.usgs.gov/edu/watercyclesummary.html</ref> This natural cycling of water through a variety of different locations on the Earth means that through the history of the Earth, the amount of water has been relatively constant. Little has been added or lost over the years, and this water has been continuously in motion.<ref name="RE1">Environment Canada. (August 20, 2015). ''The Hydrologic Cycle'' [Online]. Available: https://www.ec.gc.ca/eau-water/default.asp?lang=En&n=23CEC266-1</ref>		<onlyinclude>The '''hydrologic cycle''', also known as the '''water cycle''' is a way of describing the [[material flow]] of water throughout the [[Earth]]. This series of steps describes how [[water]] moves across the Earth and changes form. These specific steps result in the circulation of water between [[ocean]]s, the [[atmosphere]], and the land. The water cycle involves natural phenomena that include [[precipitation]] such as [[rain]] and [[snow]], drainage from rivers, and the return of water to the atmosphere through [[evaporation]] and [[transpiration]].</onlyinclude><ref name=usgs>USGS Water School. (August 31, 2015). ''The Water Cycle Summary'' [Online]. Available: http://water.usgs.gov/edu/watercyclesummary.html</ref> This natural cycling of water through a variety of different locations on the Earth means that through the history of the Earth, the amount of water has been relatively constant. Little has been added or lost over the years, and this water has been continuously in motion.<ref name="RE1">Environment Canada. (August 20, 2015). ''The Hydrologic Cycle'' [Online]. Available: https://www.ec.gc.ca/eau-water/default.asp?lang=En&n=23CEC266-1</ref>

	[[File:Watercyclesummary.jpg\|400px\|framed\|center\|Figure 1. A diagram showing the major components of the water cycle.<ref>Wikimedia Commons. (August 20, 2015). ''Water Cycle Summary'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/1/19/Watercyclesummary.jpg</ref>]]		[[File:Watercyclesummary.jpg\|400px\|framed\|center\|Figure 1. A diagram showing the major components of the water cycle.<ref>Wikimedia Commons. (August 20, 2015). ''Water Cycle Summary'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/1/19/Watercyclesummary.jpg</ref>]]

	The cycle has two primary components: '''[[water storage\|storage]]''' and '''movement'''. Storage is where water in the [[system]] resides or "rests" as it moves from one water reservoir to another. For example, water enters a lake through some movement such as precipitation. After it enters the lake, it stays there for some period of time in its storage phase. Eventually, the water moves back out through some movement, such as evaporation into the atmosphere, discharge into a river, or migration into the subsurface groundwater system. This continuous movement of water among the various storage reservoirs is termed the hydrologic cycle.<ref name="RE1"/>		The cycle has two primary components: '''[[water storage\|storage]]''' and '''movement'''. Storage is where water in the [[system]] resides or "rests" as it moves from one water reservoir to another. For example, water enters a lake through some movement such as precipitation. After it enters the lake, it stays there for some period of time in its storage phase. Eventually, the water moves back out through some movement, such as evaporation into the atmosphere, discharge into a river, or migration into the subsurface [[groundwater]] system. This continuous movement of water among the various storage reservoirs is termed the hydrologic cycle.<ref name="RE1"/>

	It is important to note that water requires energy to change states - from [[solid]] to [[liquid]] is called the [[enthalpy of fusion]], and from liquid to gas is called the [[enthalpy of vaporization]]. The evaporation of water from the oceans and evapotranspiration from continents is a particularly important component of the hydrologic cycle that requires a change of state and input of energy. Since nature follows the [[law of conservation of energy]], the [[energy]] to fuel this cycle must come from somewhere. In the hydrologic cycle, this energy comes from the [[Sun]].		It is important to note that water requires energy to change states - from [[solid]] to [[liquid]] is called the [[enthalpy of fusion]], and from liquid to gas is called the [[enthalpy of vaporization]]. The evaporation of water from the oceans and evapotranspiration from continents is a particularly important component of the hydrologic cycle that requires a change of state and input of energy. Since nature follows the [[law of conservation of energy]], the [[energy]] to fuel this cycle must come from somewhere. In the hydrologic cycle, this energy comes from the [[Sun]].
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	===Groundwater Flow===		===Groundwater Flow===
	Groundwater is water that is held in cracks and pore spaces below ground. This water can be tapped by water supply wells or continue moving below the ground until it eventually returns to the surface. The process by which groundwater exits the ground is known as groundwater discharge. This groundwater can either discharge directly into oceans, or more commonly, it discharges to surface water (lakes and rivers) and then travels to the ocean as surface runoff.<ref name="RE1"/>		Groundwater is water that is held in cracks and pore spaces below ground. This water can be tapped by water supply wells or continue moving below the ground until it eventually returns to the surface. The process by which groundwater exits the ground is known as groundwater discharge. This groundwater can either discharge directly into oceans, or more commonly, it discharges to surface water (lakes and rivers) and then travels to the ocean as surface runoff.<ref name="RE1"/>

			For more information please see [[Groundwater as a part of the hydrologic cycle]].

	==References==		==References==
	{{reflist}}[[Category:Uploaded]]		{{reflist}}[[Category:Uploaded]]

Jmdonev: 1 revision imported: From the summer

2016-09-17T22:29:26Z

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Jmdonev at 17:20, 22 July 2016

2016-07-22T17:20:14Z

← Older revision		Revision as of 17:20, 22 July 2016
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	<onlyinclude>The '''hydrologic cycle''', also known as the '''water cycle''' is a way of describing the [[material flow]] of water throughout the [[Earth]]. This series of steps describes how [[water]] moves across the Earth and changes form. These specific steps result in the circulation of water between [[ocean]]s, the [[atmosphere]], and the land. The water cycle involves natural phenomena that include [[precipitation]] such as [[rain]] and [[snow]], drainage from rivers, and the return of water to the atmosphere through [[evaporation]] and [[transpiration]].</onlyinclude><ref name=usgs>USGS Water School. (August 31, 2015). ''The Water Cycle Summary'' [Online]. Available: http://water.usgs.gov/edu/watercyclesummary.html</ref> This natural cycling of water through a variety of different locations on the Earth means that through the history of the Earth, the amount of water has been relatively constant. Little has been added or lost over the years, and this water has been continuously in motion.<ref name="RE1">Environment Canada. (August 20, 2015). ''The Hydrologic Cycle'' [Online]. Available: https://www.ec.gc.ca/eau-water/default.asp?lang=En&n=23CEC266-1</ref>		<onlyinclude>The '''hydrologic cycle''', also known as the '''water cycle''' is a way of describing the [[material flow]] of water throughout the [[Earth]]. This series of steps describes how [[water]] moves across the Earth and changes form. These specific steps result in the circulation of water between [[ocean]]s, the [[atmosphere]], and the land. The water cycle involves natural phenomena that include [[precipitation]] such as [[rain]] and [[snow]], drainage from rivers, and the return of water to the atmosphere through [[evaporation]] and [[transpiration]].</onlyinclude><ref name=usgs>USGS Water School. (August 31, 2015). ''The Water Cycle Summary'' [Online]. Available: http://water.usgs.gov/edu/watercyclesummary.html</ref> This natural cycling of water through a variety of different locations on the Earth means that through the history of the Earth, the amount of water has been relatively constant. Little has been added or lost over the years, and this water has been continuously in motion.<ref name="RE1">Environment Canada. (August 20, 2015). ''The Hydrologic Cycle'' [Online]. Available: https://www.ec.gc.ca/eau-water/default.asp?lang=En&n=23CEC266-1</ref>

J.williams: 1 revision imported

2015-11-13T01:47:40Z

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Jmdonev at 20:19, 8 November 2015

2015-11-08T20:19:06Z

← Older revision		Revision as of 20:19, 8 November 2015
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	<onlyinclude>The '''hydrologic cycle''', also known as the '''water cycle''' is a way of describing the [[material flow]] of water throughout the [[Earth]]. This series of steps describes how [[water]] moves across the Earth and changes form. These specific steps result in the circulation of water between [[ocean]]s, the [[atmosphere]], and the land. The water cycle involves natural phenomena that include [[precipitation]] such as [[rain]] and [[snow]], drainage from rivers, and the return of water to the atmosphere through [[evaporation]] and [[transpiration]].</onlyinclude><ref name=usgs>USGS Water School. (August 31, 2015). ''The Water Cycle Summary'' [Online]. Available: http://water.usgs.gov/edu/watercyclesummary.html</ref> This natural cycling of water through a variety of different locations on the Earth means that through the history of the Earth, the amount of water has been relatively constant. Little has been added or lost over the years, and this water has been continuously in motion.<ref name="RE1">Environment Canada. (August 20, 2015). ''The Hydrologic Cycle'' [Online]. Available: https://www.ec.gc.ca/eau-water/default.asp?lang=En&n=23CEC266-1</ref>		<onlyinclude>The '''hydrologic cycle''', also known as the '''water cycle''' is a way of describing the [[material flow]] of water throughout the [[Earth]]. This series of steps describes how [[water]] moves across the Earth and changes form. These specific steps result in the circulation of water between [[ocean]]s, the [[atmosphere]], and the land. The water cycle involves natural phenomena that include [[precipitation]] such as [[rain]] and [[snow]], drainage from rivers, and the return of water to the atmosphere through [[evaporation]] and [[transpiration]].</onlyinclude><ref name=usgs>USGS Water School. (August 31, 2015). ''The Water Cycle Summary'' [Online]. Available: http://water.usgs.gov/edu/watercyclesummary.html</ref> This natural cycling of water through a variety of different locations on the Earth means that through the history of the Earth, the amount of water has been relatively constant. Little has been added or lost over the years, and this water has been continuously in motion.<ref name="RE1">Environment Canada. (August 20, 2015). ''The Hydrologic Cycle'' [Online]. Available: https://www.ec.gc.ca/eau-water/default.asp?lang=En&n=23CEC266-1</ref>

	[[File:Watercyclesummary.jpg\|400px\|framed\|center\|Figure 1. A diagram showing the major components of the water cycle.<ref>Wikimedia Commons. (August 20, 2015). ''Water Cycle Summary'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/1/19/Watercyclesummary.jpg</ref>]]		[[File:Watercyclesummary.jpg\|400px\|framed\|center\|Figure 1. A diagram showing the major components of the water cycle.<ref>Wikimedia Commons. (August 20, 2015). ''Water Cycle Summary'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/1/19/Watercyclesummary.jpg</ref>]]

	The cycle has two primary components: '''[[water storage\|storage]]''' and '''movement'''. Storage is where water in the [[system]] "rests" ~~when~~ it ~~is not being actively moved~~. For example, water enters a lake through some movement such as precipitation. After it enters the lake, it stays there for some period of time in its storage phase. Eventually, the water moves back out through some movement, such as evaporation into the atmosphere. This continuous ~~cycling~~ is the hydrologic cycle.<ref name="RE1"/>		The cycle has two primary components: '''[[water storage\|storage]]''' and '''movement'''. Storage is where water in the [[system]] resides or "rests" as it moves from one water reservoir to another. For example, water enters a lake through some movement such as precipitation. After it enters the lake, it stays there for some period of time in its storage phase. Eventually, the water moves back out through some movement, such as evaporation into the atmosphere, discharge into a river, or migration into the subsurface groundwater system. This continuous movement of water among the various storage reservoirs is termed the hydrologic cycle.<ref name="RE1"/>

	It is important to note that water requires energy to change states - from [[solid]] to [[liquid]] is called the [[enthalpy of fusion]], and from liquid to gas is called the [[enthalpy of vaporization]]. Since nature follows the [[law of conservation of energy]], the [[energy]] to fuel this cycle must come from somewhere. In the hydrologic cycle, this energy comes from the [[Sun]].		It is important to note that water requires energy to change states - from [[solid]] to [[liquid]] is called the [[enthalpy of fusion]], and from liquid to gas is called the [[enthalpy of vaporization]]. The evaporation of water from the oceans and evapotranspiration from continents is a particularly important component of the hydrologic cycle that requires a change of state and input of energy. Since nature follows the [[law of conservation of energy]], the [[energy]] to fuel this cycle must come from somewhere. In the hydrologic cycle, this energy comes from the [[Sun]].

	==Response to global temperatures==		==Response to global temperatures==
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	==Storage==		==Storage==
	:: [[water storage\|''main article'']]		:: [[water storage\|''main article'']]
	The storage of water in the hydrologic cycle is vastly important on the Earth. Water can be stored in three main places: the atmosphere, on the surface of the Earth, and underground.<ref name="RE3">NOAA. (August 20, 2015). ''Description of the Hydrologic Cycle'' [Online]. Available: http://www.nwrfc.noaa.gov/info/water_cycle/hydrology.cgi</ref> Specifically these water storage areas are known as [[reservoir]]s and include oceans, glacier ice, groundwater, lakes, soil moisture, living organisms, the atmosphere, and rivers.<ref name=geo>Stephen Marshak. ''Earth: Portrait of a Planet'', 3rd ed. New York, NY, U.S.A:W.W. Norton & Company, 2008</ref> Collectively, all water storage areas make up the [[hydrosphere]]. Most water on earth is found in oceans and seas, then in glaciers and groundwater. ~97% of the world's water is stored in the oceans as saltwater.<ref name=geo/> Because the overwhelming majority of water is stored here, this can be seen as the start and end point of the cycle. Water that starts here evaporates up into the atmosphere, where the majority of it falls back into the ocean as rain, or a much smaller amount falls onto land.		The storage of water in the hydrologic cycle is vastly important on the Earth. Water can be stored in three main places: the atmosphere, on the surface of the Earth, and underground.<ref name="RE3">NOAA. (August 20, 2015). ''Description of the Hydrologic Cycle'' [Online]. Available: http://www.nwrfc.noaa.gov/info/water_cycle/hydrology.cgi</ref> Specifically these water storage areas are known as [[reservoir]]s and include oceans, glacier ice, groundwater, lakes, soil moisture, living organisms, the atmosphere, and rivers.<ref name=geo>Stephen Marshak. ''Earth: Portrait of a Planet'', 3rd ed. New York, NY, U.S.A:W.W. Norton & Company, 2008</ref> Collectively, all water storage areas make up the [[hydrosphere]]. Most water on earth is found in oceans and seas, then in glaciers and groundwater. ~97% of the world's water is stored in the oceans as saltwater.<ref name=geo/> Because the overwhelming majority of water is stored here, this can be seen as the start and end point of the cycle. Water that starts here evaporates up into the atmosphere, where the majority of it falls back into the ocean as rain, while a much smaller amount falls onto land.

	Water moves from reservoir to reservoir through a variety of different transportation mechanisms, but this water can stay in storage for varying lengths of time. The movement water from place to place can be fairly erratic, but there ~~tends to be~~ trends for how long certain types of reservoirs maintain their water for. The average length of time that water stays in any reservoir in the hydrologic cycle is known as the [[residence time]]. Water the water in the atmosphere is renewed every 15 days, while soil moisture lasts a couple of months. Lakes replenish their water every 50 to 100 years, while groundwater can last anywhere from 100 to 10 000 years. Finally, ice caps hold water the longest with residence times of up to 200 000 years.<ref name=geo/>		Water moves from reservoir to reservoir through a variety of different transportation mechanisms, but this water can stay in storage for varying lengths of time. The movement of water from place to place can be fairly erratic, but there are trends for how long certain types of reservoirs maintain their water for. The average length of time that water stays in any reservoir in the hydrologic cycle is known as the [[residence time]]. Water the water in the atmosphere is renewed every 15 days, while soil moisture lasts a couple of months. Lakes replenish their water every 50 to 100 years, while groundwater can last anywhere from 100 to 10 000 years. Finally, ice caps hold water the longest with residence times of up to 200 000 years.<ref name=geo/>

	The type of storage that occurs on the land surface and under the ground largely depend on the geologic features related to the types of soil and the types of rocks present at the storage locations.		The type of storage that occurs on the land surface and under the ground largely depend on the geologic features related to the types of soil and the types of rocks present at the storage locations.
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	===Transpiration===		===Transpiration===
	This is the process of water vapour being emitted by plant leaves.<ref name="RE1"/>		This is the process of water vapour being emitted by plant leaves.<ref name="RE1"/>
			===Evapotranspiration===
			In practical terms, when water vapour leaves a vegetated surface it is often difficult to distinguish between evaporation from the soil surface and transpiration from plants. Therefore, these combined processes are commonly referred to as evapotranspiration.
	===Sublimation===		===Sublimation===
	When water moves directly from a solid to a gaseous state without ever entering the liquid state. This process allows water in glaciers to enter the atmosphere directly.		When water moves directly from a solid to a gaseous state without ever entering the liquid state. This process allows water in snow or glaciers to enter the atmosphere directly.
	===Condensation===		===Condensation===
	When water vapour rises, it cools slightly and condenses. Generally, the water condenses on dust particles in the [[air]] and becomes liquid. Sometimes the water skips the liquid phase and turns directly into a solid - in the form of ice, hail, or snow. In the liquid form the particles collect and form clouds.<ref name="RE1"/>		When water vapour rises, it cools slightly and condenses. Generally, the water condenses on dust particles in the [[air]] and becomes liquid. Sometimes the water skips the liquid phase and turns directly into a solid - in the form of ice, hail, or snow. In the liquid form the particles collect and form clouds.<ref name="RE1"/>
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	===Runoff===		===Runoff===
	Rain or snowmelt can move water over land and form small creeks or collect in ditches. Runoff is the visible flow of water in rivers or creeks as water, previously stored in a basin, drains.<ref name="RE1"/>		Rain or snowmelt can move water over land and form small creeks or collect in ditches. Runoff is the visible flow of water in rivers or creeks as water, previously stored in a basin, drains.<ref name="RE1"/>
	===Percolation===		===Infiltration and Percolation===
	When precipitation falls on the ground, some of it moves downwards ~~through~~ cracks, joints, and pores in the soil until it reaches the water table. At this point it becomes groundwater. This is a slow process, which is why more water flows back to the ocean through surface runoff than groundwater discharge.<ref name="RE1"/>		When precipitation falls on the ground, some of it moves downwards into cracks, joints, and pores in the soil. The entry of water into the subsurface is termed infiltration. The process of percolation refers to the subsequent movement of water through subsurface soil pores until it reaches the water table. At this point it becomes groundwater. This is a slow process, which is why more water flows back to the ocean through surface runoff than groundwater discharge.<ref name="RE1"/>
	===Groundwater Flow===		===Groundwater Flow===
	Groundwater is water that is held in cracks and pore spaces below ground. This water can be tapped by wells or ~~could move~~ below ground. The process by which groundwater exits the ground is known as groundwater discharge. This can either ~~be direct~~ discharge into oceans, or ~~indirect discharge~~, ~~where~~ water ~~stored in groundwater is discharged into a river baseflow,~~ and then travels to the ocean as surface runoff.<ref name="RE1"/>		Groundwater is water that is held in cracks and pore spaces below ground. This water can be tapped by water supply wells or continue moving below the ground until it eventually returns to the surface. The process by which groundwater exits the ground is known as groundwater discharge. This groundwater can either discharge directly into oceans, or more commonly, it discharges to surface water (lakes and rivers) and then travels to the ocean as surface runoff.<ref name="RE1"/>

	==References==		==References==
	{{reflist}}[[Category:Uploaded]]		{{reflist}}[[Category:Uploaded]]
	~~[[category: Ed edit]]~~

J.williams: 1 revision imported

2015-09-18T16:51:07Z

1 revision imported

← Older revision	Revision as of 16:51, 18 September 2015
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Jmdonev at 19:54, 17 September 2015

2015-09-17T19:54:27Z

← Older revision		Revision as of 19:54, 17 September 2015
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	<onlyinclude>The '''hydrologic cycle''', also known as the '''water cycle''' is a way of describing the [[material flow]] of water throughout the Earth. This series of steps describes how [[water]] moves across the Earth and changes form. These specific steps result in the circulation of water between [[ocean]]s, the [[atmosphere]], and the land. The water cycle involves natural phenomena that include [[precipitation]] such as [[rain]] and [[snow]], drainage from rivers, and the return of water to the atmosphere through [[evaporation]] and [[transpiration]].</onlyinclude><ref name=usgs>USGS Water School. (August 31, 2015). ''The Water Cycle Summary'' [Online]. Available: http://water.usgs.gov/edu/watercyclesummary.html</ref> This natural cycling of water through a variety of different locations on the Earth means that through the history of the Earth, the amount of water has been relatively constant. Little has been added or lost over the years, and this water has been continuously in motion.<ref name="RE1">Environment Canada. (August 20, 2015). ''The Hydrologic Cycle'' [Online]. Available: https://www.ec.gc.ca/eau-water/default.asp?lang=En&n=23CEC266-1</ref>		<onlyinclude>The '''hydrologic cycle''', also known as the '''water cycle''' is a way of describing the [[material flow]] of water throughout the [[Earth]]. This series of steps describes how [[water]] moves across the Earth and changes form. These specific steps result in the circulation of water between [[ocean]]s, the [[atmosphere]], and the land. The water cycle involves natural phenomena that include [[precipitation]] such as [[rain]] and [[snow]], drainage from rivers, and the return of water to the atmosphere through [[evaporation]] and [[transpiration]].</onlyinclude><ref name=usgs>USGS Water School. (August 31, 2015). ''The Water Cycle Summary'' [Online]. Available: http://water.usgs.gov/edu/watercyclesummary.html</ref> This natural cycling of water through a variety of different locations on the Earth means that through the history of the Earth, the amount of water has been relatively constant. Little has been added or lost over the years, and this water has been continuously in motion.<ref name="RE1">Environment Canada. (August 20, 2015). ''The Hydrologic Cycle'' [Online]. Available: https://www.ec.gc.ca/eau-water/default.asp?lang=En&n=23CEC266-1</ref>

	[[File:Watercyclesummary.jpg\|400px\|framed\|center\|Figure 1. A diagram showing the major components of the water cycle.<ref>Wikimedia Commons. (August 20, 2015). ''Water Cycle Summary'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/1/19/Watercyclesummary.jpg</ref>]]		[[File:Watercyclesummary.jpg\|400px\|framed\|center\|Figure 1. A diagram showing the major components of the water cycle.<ref>Wikimedia Commons. (August 20, 2015). ''Water Cycle Summary'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/1/19/Watercyclesummary.jpg</ref>]]

	The cycle has two primary components: '''[[water storage\|storage]]''' and '''movement'''. Storage is where water in the system "rests" when it is not being actively moved. For example, water enters a lake through some movement such as precipitation. After it enters the lake, it stays there for some period of time in its storage phase. Eventually, the water moves back out through some movement, such as evaporation into the atmosphere. This continuous cycling is the hydrologic cycle.<ref name="RE1"/>		The cycle has two primary components: '''[[water storage\|storage]]''' and '''movement'''. Storage is where water in the [[system]] "rests" when it is not being actively moved. For example, water enters a lake through some movement such as precipitation. After it enters the lake, it stays there for some period of time in its storage phase. Eventually, the water moves back out through some movement, such as evaporation into the atmosphere. This continuous cycling is the hydrologic cycle.<ref name="RE1"/>

	It is important to note that water requires energy to change states - from [[solid]] to [[liquid]] is called the [[enthalpy of fusion]], and from liquid to gas is called the [[enthalpy of vaporization]]. Since nature follows the [[law of conservation of energy]], the [[energy]] to fuel this cycle must come from somewhere. In the hydrologic cycle, this energy comes from the [[Sun]].		It is important to note that water requires energy to change states - from [[solid]] to [[liquid]] is called the [[enthalpy of fusion]], and from liquid to gas is called the [[enthalpy of vaporization]]. Since nature follows the [[law of conservation of energy]], the [[energy]] to fuel this cycle must come from somewhere. In the hydrologic cycle, this energy comes from the [[Sun]].
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	===Evaporation===		===Evaporation===
	Here, water is heated by [[solar radiation]] from the Sun. Water [[molecule]]s on the surface of oceans, rivers, lakes, ponds, and other bodies of water become energized by this. When sufficiently energized, the water molecules are able to break free from the forces binding them together and they evaporate, rising into the atmosphere as water vapour.<ref name="RE1"/> 97.5% of the earth's water is contained in the ocean, so a large amount of water enters the atmosphere through evaporation at the oceans surface.<ref name="RE2">Igor A. Shiklomanov, State Hydrological Institute (SHI, St. Petersburg) and United Nations Educational, Scientific and Cultural Organisation (UNESCO, Paris), 1999.</ref>		Here, water is heated by [[solar radiation]] from the Sun. Water [[molecule]]s on the surface of oceans, rivers, lakes, ponds, and other bodies of water become energized by this. When sufficiently energized, the water molecules are able to break free from the forces binding them together and they evaporate, rising into the atmosphere as [[water vapour]].<ref name="RE1"/> 97.5% of the earth's water is contained in the ocean, so a large amount of water enters the atmosphere through evaporation at the oceans surface.<ref name="RE2">Igor A. Shiklomanov, State Hydrological Institute (SHI, St. Petersburg) and United Nations Educational, Scientific and Cultural Organisation (UNESCO, Paris), 1999.</ref>
	===Transpiration===		===Transpiration===
	This is the process of water vapour being emitted by plant leaves.<ref name="RE1"/>		This is the process of water vapour being emitted by plant leaves.<ref name="RE1"/>
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	When water moves directly from a solid to a gaseous state without ever entering the liquid state. This process allows water in glaciers to enter the atmosphere directly.		When water moves directly from a solid to a gaseous state without ever entering the liquid state. This process allows water in glaciers to enter the atmosphere directly.
	===Condensation===		===Condensation===
	When water vapour rises, it cools slightly and condenses. Generally, the water condenses on dust particles in the air and becomes liquid. Sometimes the water skips the liquid phase and turns directly into a solid - in the form of ice, hail, or snow. In the liquid form the particles collect and form clouds.<ref name="RE1"/>		When water vapour rises, it cools slightly and condenses. Generally, the water condenses on dust particles in the [[air]] and becomes liquid. Sometimes the water skips the liquid phase and turns directly into a solid - in the form of ice, hail, or snow. In the liquid form the particles collect and form clouds.<ref name="RE1"/>
	===Precipitation===		===Precipitation===
	:: [[precipitation\|''main article'']]		:: [[precipitation\|''main article'']]
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	==References==		==References==
	{{reflist}}		{{reflist}}[[Category:Uploaded]]
			[[category: Ed edit]]