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Published byLesley Sparks Modified over 6 years ago
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Deposits by Glaciers Most of the material carried by glaciers is deposited by melting, called drift. 2 kinds of drift: Till is left under or along the sides of a moving glacier Outwash is deposits from meltwater Till at the edge of a glacier Glacial outwash plain
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Moraines The ground moraine forms a thin, fairly even deposit over the area of the glacier. Lateral and medial moraines form ridges The end moraine forms a ridge at the ice front, when a glacier recedes, recessional moraines form. The terminal moraine marks the glaciers farthest advance Large glacial boulders are called erratics.
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Moraines
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Drumlins Drumlins are long, smooth canoe-shaped hills made of till, typically 400 m long, 100 m wide, 25 m high. Likely formed when a glacier swept over a previous moraine
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Outwash Plains and Eskers
Outwash plains look like alluvial fans made up of deposits from meltwater at the ice front. Subglacial streams leave deposits as winding ridges called Eskers.
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Kames, Kettles and Deltas
Kames are small cone-shaped hills of stratified sand and gravel, formed by stream deposits Kettles are circular hollows found on terminal plains and outwash plains, formed by melting blocks of buried ice. Deltas may form when glacial streams empty into lakes.
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Lakes Made by Glaciers Glaciation leaves new basins or depressions in the land surface These may fill with water to form lakes, ponds, or swamps. Types of lakes: Cirque lakes, Kettle lakes, Moraine dammed lakes, Valley scoured lakes.
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