desalination: getting fresh water from seawater.
water cycle: the continuous movement of water between Earht´s surface and the air, changinng from liquid to gas to liquid.
ground water: water that seeps into the ground into spaces between bits of rock and soil.
water table: the top of the water filled spaces in the ground.
spring: a place where groundwater seeps out of the ground.
well: a hole dug below the water table that water seeps into.
reservoir: a storage area for freshwater supplies.
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