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goundwater This is water that collects in spaces, cracks, rocks and soil underground. irrigation This is how fresh water is supplied to farms and fields. water reclamation This is the recycling of waste water so it can be used again. aquifer This is an underground layer of rock or soil where water moves easily. conservation This is the careful use of natural resources. aqueduct This is a system of channels, pipes, and tunnels that carry water a long distance. desalination This is the process by which salt is removed from salty water. well A hole dug into an underground area with water. watershed This is the region of land that drains into a river. ocean This is the body of water that covers most of the earth. glaciers This is where you can find fresh water frozen as ice. Can people drink ocean water? No, because people can't drink salt water. Colorado River This is where we get most of our water in California. reservoir This is a place where water is stored and held for people to use. evaporation This is when water disappears into the air. condensation This is when water comes together in the air and forms clouds. independent variable This is the part of an experiement that is changed. controlled variable This is the part of the experiment that is not changed. dependent variable This is the part of the experiment that is measured. precipitation This is what water is called when it falls from the sky.