Glaciers are geologically important because they erode, transport, and deposit so much material.

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Glaciers are powerful agents of erosion, capable of carving valleys and fjords, and transporting huge quantities of sediment and rocks. As they move, glaciers also deposit material, forming distinctive landforms such as moraines, eskers, and drumlins. This makes them important contributors to changes in the Earth's surface over time.

Glaciers Are Geologically Important Because They Erode, Transport, and Deposit