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Water is supplied to the atmosphere by evaporation from the surface, and leaves the atmosphere via...

Water is supplied to the atmosphere by evaporation from the surface, and leaves the atmosphere via precipitation. The average amount of time a water molecule spends in the atmosphere can be derived by dividing the amount of water vapor in the atmosphere (1.1?1016 ??) by the globally-averaged rate of precipitation to the Earth’s surface of 3.1 ?? ??? −1 . Using these data, calculate how many days, on average, a water molecule spend in the atmosphere before it precipitates out.

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