Periods of Earth's history with extensive sea ice result in enhanced albedo, leading to more cooling. This is referred to as

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The phenomenon described in the statement where extensive sea ice leads to enhanced albedo, creating more cooling, is an example of positive feedback. This is because the initial change (formation of sea ice) leads to an amplification of the change (cooling due to enhanced albedo), which in turn leads to more sea ice formation and even greater cooling.

Periods of Earth's History with Extensive Sea Ice Result in Enhanced