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?

In a balanced water budget, total precipitation equals total evaporation. Precipitation is 420,000 + 130,000 = 550,000 km³, so ocean evaporation is 550,000 − 90,000 = 460,000 km³. The correct choice is 460,000 km³.

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