"a large body of salt water", "ocean" "water that has little or no salt", "fresh water" "the changing of a liquid into a gas", "evaporation" "water in the form of an invisible, odorless gas", "water vapor" "the changing of a gas into a liquid", "condensation" "droplets of water that form in the atmosphere and fall to the ground", "precipitation" "the continuous movement of water between Earth's surface and the air", "water cycle" "a human-made lake that is used to store water", "reservoir" "a barrier that prevents the normal flow of water", "dam" "water beneath Earth's surface", "groundwater" "an underground layer of rock that can hold water", "aquifer" "the area where water drains into a river", "watershed" "the overflow of water from the banks of a body of water onto the land", "flood" "a long period of dry weather", "drought" "to make dirty or unclean", "pollute" "making something usable again", "reclamation" "a pathway built by people to move water long distances", "aqueduct" "save something to be sure there is enough", "conserve"
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