The ice ages had significant impacts on the Earth's water systems. They led to the formation of many of today's geographical features, including valleys, mountains, and lakes. The weight of the ice sheets also depressed the Earth's crust, causing changes in the flow of rivers and the formation of new water bodies. Additionally, the melting of ice sheets contributed to sea level rise, altering the coastline and leading to the creation of new islands and peninsulas. The ice ages also affected ocean currents, which in turn influenced climate patterns.
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