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Download Water Cycle - Western Reserve Public Media
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BIOGEOCHEMICAL CYCLES Biogeochemical Big word; simple idea Bio = life Geo = earth Chemical = substance So biogeochemical = substances involved with life on earth. Water Cycle Water Is Everywhere 75% of the earth’s surface is covered with water. All living things contain water. There is water in the atmosphere. Water on the Move Water continually cycles from the earth to the atmosphere and back again. Evaporation Water evaporates (changes from a liquid to a gas). Condensation Water condenses (changes from a gas to a liquid). Precipitation Water returns to earth’s surface in the form of rain, sleet, snow or hail. The Very Simple Version Condensation Precipitation Evaporation It’s more complicated than that. Transpiration Plants return water to the atmosphere. Plant loses water through leaves Plant sucks in water through roots Perspiration Animals return water to the atmosphere when they sweat, pant, breathe, etc. Infiltration Water goes into the ground. It filters through soil, rocks, etc. Diagram courtesy of the U.S. Geological Survey Runoff Some water moves along the surface of the ground collecting in low areas. Diagram courtesy of the U.S. Geological Survey Ground Water Water filters into soil and rock until it comes to rocks it cannot pass through. Water may fill spaces in rocks and soil. An aquifer is a pool of underground water.
