Ice erodes rock over time in a process called weathering (which also entails other weather-related erosion, such as rainfall, streams, and waves). Glaciers can form valleys, which can commonly be seen today where glaciers are no long found. Glaciers can also cause fragments, and are the most powerful form of water-erosion. The chemical composition of rocks can also be altered when water freezes and thaws, and inevitably weakens the rocks over time.
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