scratches in rock produced by glacial abrasion are called
Glacial striation Glacial striations are scratches or gouges cut into bedrock by glacial abrasion. These scratches and gouges were first recognized as the result of a moving glacier in the late 18th century when Swiss alpinists first associated them with moving glaciers. They also noted that if they were visible today that the glaciers must also be receding.[1]
Glacier Large masses, such as ice sheets or glaciers, can depress the crust of the Earth into the mantle.[47] The depression usually totals a third of the ice sheet or glacier's thickness.  After the ice sheet or glacier melts, the mantle begins to flow back to its original position, pushing the crust back up. This post-glacial rebound, which proceeds very slowly after the melting of the ice sheet or glacier, is currently occurring in measurable amounts in Scandinavia and the Great Lakes region of North America.