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the combined net effect of two processes: evaporation and transpiration


the process of returning moisture to the atmosphere


is the process by which plants return moisture to the air


is the cooling of water vapor until it becomes a liquid

dew point

the temperature to which a given parcel of air must be cooled, at constant barometric pressure, for water vapor to condense into water


moisture that falls from the atmosphere as rain, snow, sleet, or hail


the entry of water into the soil surface


the downward movement of water through soil and rock


movement of water, usually from precipitation, across the earth's surface towards stream channels, lakes, oceans, or depressions or low points in the earth's surface

hydrologic cycle

the continuous movement of water between places; the water cycle

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