On average, the ratio is 1, with equal amounts of water moving from the ocean to land as precipitation (40 km ³ /yr) and moving from land to ocean in runoff (also 40 km ³ /yr).

How would this ratio change during an ice age?

How would this ratio change during an ice age?

	The ratio would remain the same because, although the amount of precipitation would decrease, all the water falling on land would still return to the oceans as runoff.
	The ratio would be > 1 because there would be more precipitation during an ice age.
	The ratio would be > 1 because some precipitation would build up on land as ice.
	The ratio would be < 1 because there would be less precipitation during an ice age.

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The ratio would be 1 because some precipitation woul... View the full answer