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The Water Cycle

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by

Darren Fox

on 2 April 2013

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Transcript of The Water Cycle

The sun shines on the surface of oceans and lakes, heating molecules of water. The more the sun heats the molecules, the faster they move, or evaporate. The sun is the driving force of the water cycle. Precipitation can fall in the form of rain, snow, sleet, freezing rain, and hail. The Sun The sun shines on the surface of oceans and lakes, heating molecules of water. The more the sun heats the molecules, the faster they move, or evaporate. Volcanoes Volcanoes also emit steam which, in the process of rising into the atmosphere, condenses and forms clouds. Atmosphere The atmosphere stores only a little of the world's water, but is a primary force in moving the water all over the globe and distributing it. Rain Snow Sleet Hail Precipitation Precipitation is when the water in the clouds falls to the ground. It most commonly falls as rain. Precipitation is how the water stored in the atmosphere gets distributed to the ground. More of the water on Earth is stored as ice and snow than is actually moving through the cycle. It is stored in glaciers and ice caps. Layers of snow and ice compress into glaciers. Much of the world's drinking water is obtained from glaciers, most commonly in Asian regions. SNOW-MELT RUNOFF Freshwater is stored in glaciers and snow during the cold season and is released through runoff in the warm season, when it fills empty or low rivers. This provides a valuable drinking source for people living nearby. The amount of water in a river increases considerably in the warm seasons when snow-melt is added to the volume. Also, snow-melt and runoff can impact flooding when there is more water than the rivers can hold. Sublimation is the process of a solid matter skipping the liquid stage and turning straight into a gas. In the water cycle, sublimation describes snow turning straight into water vapor without first becoming water. In order for this to happen, conditions require dry, cool air and winds, and lots of sunlight. It takes much more energy for ice to sublimate into water vapor than it takes it to melt into water. This requires a lot of sunlight and heat energy. The opposite of sublimation is deposition. This is when water vapor turns directly into ice. Water vapor can sublimate into both snowflakes and frost. THE SUN WATER STORAGE IN OCEANS Most of the water cycle is simply the storage of water. The oceans store approximately 332,500,000 cubic miles of the worlds water. Also, 90% the water that evaporates into the atmosphere, comes from the ocean. EVAPORATION Evaporation is the changing of
liquid water to water vapor.
Water from oceans and lakes of the world
evaporate,or rise as water vapor into t
he atmosphere CONDENSATION Condensation is the changing from water vapor to liquid water. When water vapor evaporates, it gathers in the atmosphere and creates clouds. Then, the water in the cloud condenses, and eventually falls back to earth as precipitation. FRESH WATER STORAGE Streams, rivers, creeks and ponds all store fresh water, which evaporates into the atmosphere. Fresh water is water containing less than 1,000 milligrams of dissolved solids (salt) GROUND WATER STORAGE AND DISCHARGE Vast amounts of water are stored underground, unseen, moving below our feet. This water is used for drinking and irrigation. The discharge, is it's flow rate through the underground permeable rock layer (aquifer). INFILTRATION Infiltration is the process by which water on the ground surface enters the soil. It is the process of the soil absorbing the water to be stored, and used by plants. SURFACE RUNOFF Water from rain, snow-melt, or other sources, runs across the land. This occurs when soil has been fully infiltrated, and can hold no more water, so the excess water runs across the land. WATER STORAGE IN ICE AND SNOW TRANSPIRATION Transpiration is when the stomata in a plant leaf open, and they "sweat", letting water vapor escape in their attempts to collect co2 for photosynthesis SUBLIMATION
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