Question

a model of earths 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

Explanation:

Step1: Calculate net land water flow

Net land flow = Precipitation on land - Evaporation from land
$130,000\ \text{km}^3 - 90,000\ \text{km}^3 = 40,000\ \text{km}^3$

Step2: Set ocean water balance

Ocean evaporation = Ocean precipitation + Net land flow
$420,000\ \text{km}^3 + 40,000\ \text{km}^3 = 460,000\ \text{km}^3$

Answer:

460,000 km³