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Evaporation
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The change in state from a liquid to a gas.
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Precipitation
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Water droplets or ice crystals become too heavy to remain suspended in the air and fall to the ground.
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Condensation
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The change in state from a gas to a liquid.
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Runoff
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Precipitation not absorbed by the soil.
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Water Cycle
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The continuous movement of water on, above, and below the surface of the Earth.
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Groundwater
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Water beneath the earth's surface in soil pore spaces and in fractures of rock formations.
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Transpiration
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Loss of water vapor from plants.
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Surface water
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Water that collects on the ground or in a stream, river, lake, wetland, or ocean.
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Watershed
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An area of land where all of the water that is under it or drains off of it goes to the same place.
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Aquifer
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An underground bed or layer of rock, sediment, or soil that yields water.
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Infiltration
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The process of rainwater sinking into the ground.
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