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A model of Earth’s water budget shows that the precipitation on oceans is 420,000 km3 and the precipitation on land is 130,000 km3. If the evaporation from land is 90,000 km3, how much is the evaporation from oceans?
90,000 km3
130,000 km3
460,000 km3
550,000 km3
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460,000 km3
Explanation: At steady state, precipitation on land (130,000) = evaporation from land (90,000) + runoff to oceans (40,000). That runoff (40,000) adds to ocean precipitation (420,000), so ocean evaporation = 420,000 + 40,000 = 460,000 km3.
Explanation: At steady state, precipitation on land (130,000) = evaporation from land (90,000) + runoff to oceans (40,000). That runoff (40,000) adds to ocean precipitation (420,000), so ocean evaporation = 420,000 + 40,000 = 460,000 km3.
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