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Topic: Water cycle

	Water Cycle - MSN Encarta
		The water cycle consists of four distinct stages: storage, evaporation, precipitation, and runoff.
		Water may be stored temporarily in the ground; in oceans, lakes, and rivers; and in ice caps and glaciers.
		However, because the water that evaporates from the ocean is almost free of salt, the rain and snow that fall on the earth are relatively fresh.
	encarta.msn.com /encnet/refpages/RefArticle.aspx?refid=761561145 (979 words)

	EO Library: The Water Cycle
		The notion that water is continually circulating from the ocean to the atmosphere to the land and back again to the ocean has interested scholars through most of recorded history.
		Water is everywhere on Earth and is the only known substance that can naturally exist as a gas, liquid, and solid within the relatively small range of air temperatures and pressures found at the Earth's surface.
		In all, the Earth's water content is about 1.39 billion cubic kilometers (331 million cubic miles) and the vast bulk of it, about 96.5%, is in the global oceans.
	earthobservatory.nasa.gov /Library/Water (442 words)

	The Hydrologic Cycle
		The movement and endless recycling of water between the atmosphere, the land surface, and underground is called the hydrologic cycle.
		The sun may cause the water to evaporate directly back into the atmosphere, or the force of gravity may pull it down through the pores of the soil to be stored for years as slowly moving groundwater.
		Where water infiltrates the ground, gravity pulls the water down through the pores until it reaches a depth in the ground where all of the spaces are filled with water.
	www.iwr.msu.edu /edmodule/water/cycle.htm (1176 words)

	Water Cycle
		The water cycle, also known as the hydrologic cycle, is a cycle of evaporation and condensation that continuously occurs on earth.
		Water evaporates from our many bodies of water as the earth is heated by the sun's rays.
		The tiny bits of water vapor condense back into liquid form and eventually become heavy enough to fall back down to earth in the form of rain or other precipitation, with much of it replenishing the bodies of water.
	www.mcwdn.org /WEATHER/WaterCycle.html (164 words)

	The Water Cycle, from USGS Water Science Basics. Diagram available in 60+ languages
		Earth's water is always in movement, and the water cycle, also known as the hydrologic cycle, describes the continuous movement of water on, above, and below the surface of the Earth.
		Water can change states among liquid, vapor, and ice at various places in the water cycle, with these processes happening in the blink of an eye and over millions of years.
		The water in the apple you ate yesterday may have fallen as rain half-way around the world last year or could have been used 100 million years ago by Mama Dinosaur to give her baby a bath.
	ga.water.usgs.gov /edu/watercycle.html (285 words)

	How Groundwater Fits Into The Water Cycle
		The water cycle, also known as the hydrologic cycle, begins when water from the earth’s soil, plants, and water bodies turns into water vapor through the process of evaporation.
		More and more water vapor combines with the water droplet until it is too heavy to stay in the sky any longer.
		Water has been transported through the water cycle for millions of years and will continue this cycle forever.
	www.groundwater.org /kc/gwwatercycle.html (272 words)

	Water cycle - Wikipedia, the free encyclopedia
		The water cycle — technically known as the hydrologic cycle — is the continuous circulation of water within the Earth's hydrosphere, and is driven by solar radiation.
		Water moves from compartment to compartment, such as from river to ocean, by the physical processes of evaporation, precipitation, infiltration, runoff, and subsurface flow.
		Evaporation is the transformation of water from liquid to gas phases as it moves from the ground or bodies of water into the overlying atmosphere.
	en.wikipedia.org /wiki/Water_cycle (1355 words)

	RNR: "The Water Cycle" Lesson Plan
		Seventy five percent of this water is frozen in glaciers and in ice in the polar regions.
		Water is also released from the bodies of organisms and evaporates into the atmosphere.
		Water in clouds falling to the earth as rain, snow, sleet, or hail.
	sftrc.cas.psu.edu /LessonPlans/Water/WaterCycle.html (1149 words)

	Water Cycle
		Water continually circulates between the surface of Earth and its atmosphere in what is called the hydrologic or water cycle.
		Water vapor in the atmosphere condenses as it cools to form clouds.
		Water is a major force in the sculpting of Earth's surface and is an important means of transporting the energy that drives atmospheric circulation.
	www.cotf.edu /ete/modules/waterq/cycle.html (314 words)

	Water Cycle
		Complex pathways include the passage of water from the gaseous envelope around the planet called the atmosphere, through the bodies of water on the surface of earth such as the oceans, glaciers and lakes, and at the same time (or more slowly) passing through the soil and rock layers underground.
		Water transfer is related to the porosity of the soil and the permeability of the soil profile.
		Water inside of plants is transferred from the plant to the atmosphere as water vapor through numerous individual leave openings.
	www.nwrfc.noaa.gov /info/water_cycle/hydrology.cgi (4044 words)

	Label Water Cycle Printout - EnchantedLearning.com
		Water drops that form on the outside of a glass of icy water are condensed water.
		Water vaporizes from the surfaces of oceans and lakes, from the surface of the land, and from melts in snow fields.
		Water is first absorbed by the plant's roots, then later exits by evaporating through pores in the plant.
	www.enchantedlearning.com /geology/label/watercycle (215 words)

	ISWS - Illinois Water Cycle
		The water cycle depicts water moving through the atmosphere and on and under the surface of the earth.
		This depiction shows water moving through the water cycle in Illinois and is based on 30-year (1971-2000) averages calculated by Illinois State Water Survey scientists.
		Wisconsin Agriculture in the Classroom - Agriculture and the Water Cycle
	www.sws.uiuc.edu /docs/watercycle (305 words)

	Water for life - Water Cycle (Site not responding. Last check: 2007-10-16)
		As air containing water vapour hits the mountainsides, it is forced further upwards where it is cooler.
		Water trapped in the groundcover then slowly seeps into the soil, eventually draining into streams and rivers, forming a ready supply of water when the weather is dry.
		Because water is kept within the fallen leaves, it doesn't rush along the bare surface, removing layers of soil and causing rivers to silt up.
	www.wwfmalaysia.org /water/watercycle.html (473 words)

	Water Education Foundation - Water Kids!
		Water itself is the only substance that exists in liquid, gas and solid form - the keys to the water cycle.
		Water evaporates from oceans, rivers and lakes (water in its liquid form) and rises into the atmosphere (water in its gas form) where it condenses to form clouds.
		The Water Education Foundation is a proud supporter of the CD Rom and its goal encourage children to understand the importance of caring for the environment and the role they can play within their own communities.
	www.water-ed.org /kids.asp (1093 words)

	Water cycle: The water cycle, from USGS Water Science Basics
		The water cycle describes the existence and movement of water on, in, and above the Earth.
		The water cycle has been working for billions of years and all life on Earth depends on it continuing to work; the Earth would be a pretty stale place to live without it.
		Water set free by magma began to cool down the Earth’s atmosphere, until it could stay on the surface as a liquid.
	ga.water.usgs.gov /edu/watercyclehi.html (448 words)

	A Summary of the Hydrologic Cycle: bringing all the pieces together (Site not responding. Last check: 2007-10-16)
		The hydrologic cycle begins with the evaporation of water from the surface of the ocean.
		Once the water reaches the ground, one of two processes may occur; 1) some of the water may evaporate back into the atmosphere or 2) the water may penetrate the surface and become groundwater.
		The balance of water that remains on the earth's surface is runoff, which empties into lakes, rivers and streams and is carried back to the oceans, where the cycle begins again.
	ww2010.atmos.uiuc.edu /(Gh)/guides/mtr/hyd/smry.rxml (357 words)

	The Water Cycle (Site not responding. Last check: 2007-10-16)
		The water cycle or hydrologic is a continuous cycle where water evaporates, travels into the air and becomes part of a cloud, falls down to earth as precipitation, and then evaporates again.
		Water keeps moving and changing from a solid to a liquid to a gas, over and over again.
		Because of the water cycle, water moves from the earth to the air to the earth again.
	www.pbcwater.com /water_cycle.htm (212 words)

	MSI - WATER CYCLE STUDENT ACTIVITY
		Water can be found in all three states of matter during the cycle: solid (ice caps), liquid (lakes) and gas (water vapor).
		The water on the ground percolates through the soil and some of it is absorbed by plants.
		As the plants go through photosynthesis (converting sunlight, water and carbon dioxide for their own food), they absorb water from the soil and release some of it back into the air through transpiration.
	www.msichicago.org /ed/env/envsample.html (646 words)

	Water cycle (Site not responding. Last check: 2007-10-16)
		The different water sources of the earth get their water supply from precipitation, while this precipitation in itself is the evaporation from these sources.
		Water is lost to the atmosphere as vapour from the earth, it condenses and then precipitates back in the form of rain, snow, hail, dew, frost or sleet.
		This is the hydrologic cycle that continues forever thereby maintaining a balance between the two.
	edugreen.teri.res.in /explore/water/cycle.htm (67 words)

	The Global Water Cycle
		Inadequate understanding of the water cycle is one of the dominant causes of uncertainty in climate prediction.
		Inadequate understanding of the water cycle is one of the key sources of uncertainty in climate prediction.
		Observational data sets that capture key features of the water cycle at the same place and time promise to improve estimates of key fluxes and stores within the linked water and energy cycles, which are needed to balance water and energy budgets.
	www.usgcrp.gov /usgcrp/ProgramElements/water.htm (984 words)

	[No title] (Site not responding. Last check: 2007-10-16)
		The Water Cycle is a process which consists of evaporation, transpiration, condensation, and precipitation.
		Precipitation, is one form in which the condensed water molecules return to the earth (in the form of rain, snow, sleet, hail, fog, or dew).
		Some of the water which falls in high elevations becomes runoff water, the water which runs over the ground to lower elevations to form rivers, lakes, and fertile valleys.
	www.geocities.com /capecanaveral/lab/8375/cycle.html (168 words)

	The Water Cycle
		Water constantly cycles through these forms while in the atmosphere (as water vapor or condensed as clouds), on the ground (as liquid water or snow), undergound (as groundwater), in the ocean, and as precipitation (rain, snow, sleet, hail, etc.).
		Water is the only substance on earth which comes in three different forms; liquid, solid and a gas.
		Because of this, the water remains on the surface and increases the likelihood of flash floods and surface run-off.
	library.thinkquest.org /11353/water.htm (920 words)

	Freshwater Website: Groundwater (The hydrologic cycle)
		As water is heated by the sun, it's surface molecules become sufficiently energized to break free of the attractive force binding them together, and then evaporate and rise as invisible vapour in the atmosphere.
		Water vapour is also emitted from plant leaves by a process called transpiration.
		The water table is the level at which water stands in a shallow well.
	www.ec.gc.ca /water/en/nature/grdwtr/e_cycle.htm (284 words)

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