Glacial Erosion As valley glaciers move over the earth they pick up sediments (Plucking) and scrape against other rocks (Abrasion) to carve out features in the landcapes. As valley glaciers move over the earth they pick up sediments (Plucking) and scrape against other rocks (Abrasion) to carve out features in the landcapes.
U-Shaped Valley A valley scraped out by a glacier. In the shape of a half-pipe or U.
Glacial Deposition When a glacier melts, it deposits the sediment it eroded (till)—b., creating various landforms.
Moraine (a) A hill or mound of till left behind by a glacier.
Erratic (c) Large boulder dropped off as a glacier retreats..
Drumlin Long mound (moraine) that has been smoothed in the direction of a glacier retreat.
Kettle A lake that forms because a chunk of ice breaks off a glacier and melts.
Ice Ages A Time in Earth’s History when most of the Earth was covered in Glaciers. Global temperatures were only 3 degrees colder than they are today.
By Wind Weakest agent of erosion Mainly caused by Deflation.
Process by which wind removes surface materials. Stronger wind moves larger particles. Abrasion polishes rock but creates little erosion.
Wind Deposition Two types of landforms created by wind deposition. Sand Dunes Move over time Build up on an obstacle (rock/boulder) Loess deposits Fine sediments build up in layers Helps to form fertile soil.