An aquifer receives 40 m3 of precipitation and loses 10 m3 of water through natural movement.How much water can be pumped from the aquifer to balance the budget?

To balance the aquifer’s water budget, pumping must equal the water left after natural losses. Subtract the 10 m³ lost through natural movement from the 40 m³ of precipitation: 40 − 10 = 30 m³. Therefore, 30 m³ can be pumped, which is choice C.

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