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--water that flows from a sewage treatment plant after it has been treated.
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--the process in which a material is worn away by a stream of liquid (water) or air, often due to the presence of abrasive particles in the stream.
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--a place where fresh and salt water mix, such as a bay, salt marsh, or where a river enters an ocean.
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--the process of liquid water becoming water vapor, including vaporization from water surfaces, land surfaces, and snow fields, but not from leaf surfaces. See transpiration
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--the sum of evaporation and transpiration.
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