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The medial moraine is the double line of debris running down the centre-line of the glacier. Lateral moraines can rise up to 140 meters (460 ft) over the valley floor, can be up to 3 kilometers (1.9 mi) long, and are steeper close to the glacier margin (up to 80 degrees) than further away (where slopes are typically 29 to 36 degrees).
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1.3 Moraines of the Maritimes of Canada and NE United States. 1.4 Moraines of Western Canada. 1.5 Moraines of the Great Plains of the United States.
Moraine: Built up mound of glacial till along a spot on the glacier. Feature can be terminal (at the end of a glacier, showing how far the glacier extended), lateral (along the sides of a glacier), or medial (formed by the merger of lateral moraines from contributory glaciers). Types: Pulju, Rogen, Sevetti, terminal, Veiki
Till is the material that makes up ground, lateral and (not always present) medial moraines. Ground moraine consists of material that was once beneath the glacier and was transported by it and deposited across wide areas of the former glacier bed. The lateral moraines comprise that eroded material which is carried along at the sides of a glacier.
The accumulation zone is found at the highest altitude of the glacier, where accumulation of material is greater than ablation. On a glacier, the accumulation zone is the area above the firn line, where snowfall accumulates and exceeds the losses from ablation, (melting, evaporation, and sublimation).
[22], [23] Sediments that form the lateral moraines can be the result of frost weathering of the valley wall as the glacier passes through a region or sediment deposition by streams flowing into the glacial valley. [22] These sediments settle into a ridge as the glacier retreats. Medial Moraine: Nuussuaq Peninsula, Greenland.
Lateral moraine on a glacier joining the Gorner Glacier, Zermatt, Swiss Alps. The moraine is the high bank of debris in the top left hand quarter of the image. Glaciologist Erin Pettit in Antarctica, 2016. Glaciology (from Latin glacies 'frost, ice' and Ancient Greek λόγος 'subject matter'; lit.