Water In Our AtmosphereThe term for the amount of water vapor in the atmosphere in humidity. Relative humidity means the ratio of the amount of water vapor in the air to the maximum amount of water vapor that can exist at that temperature. Freshwater is usually found in the atmosphere, streams, and lakes. 25% of freshwater is groundwater. Deep below the surface, there exists a saturated zone, where groundwater fills in the pore spaces.
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