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Plucking, also referred to as quarrying, is a glacial phenomenon that is responsible for the weathering and erosion of pieces of bedrock, especially large "joint blocks". This occurs in a type of glacier called a "valley glacier".
Plucking – pieces of bedrock are cracked off by glaciers, producing larger erratics. Ice thrusting – the glacier freezes to its bed, moving large sheets of frozen sediment at its base along with it. Glacially induced spalling – layers of rock are spalled off the rocks below the glacier during ice lens formation. This provides smaller ...
A terminal moraine, also called an end moraine, is a type of moraine that forms at the terminal (edge) of a glacier, marking its maximum advance. At this point, debris that has accumulated by plucking and abrasion, has been pushed by the front edge of the ice, is driven no further and instead is deposited in an unsorted pile of sediment.
Roche moutonnée near Myot Hill, Scotland In glaciology, a roche moutonnée (or sheepback) is a rock formation created by the passing of a glacier.The passage of glacial ice over underlying bedrock often results in asymmetric erosional forms as a result of abrasion on the "stoss" (upstream) side of the rock, and plucking (i.e. pieces cracked off) on the "lee" (downstream) side.
Chatter marks on sandstone south of Lac Beauchamp, in Gatineau, Quebec, Canada. In glacial geology, a chatter mark is a wedge-shaped mark (usually of a series of such marks) left by chipping of a bedrock surface by rock fragments carried in the base of a glacier (glacial plucking).
As glaciers move across a surface, they pluck rocks from it, and incorporate them into their mass. At the coast, fragments of glacier detach and float away as icebergs, which are often transported many miles into the ocean, where they melt and deposit their load. When entrained rocks sink to the ocean floor, they can be incorporated into the ...
Cyclopean stairs can also form at points where tributary glaciers feed into larger central glaciers. The tributary glacier causes the central glacier to thicken and downcut more rapidly. This may cause a very sudden drop in the valley floor at the points where the glaciers converged. They may also form at the head of a glacier.
A glacier is a persistent body of dense ice, a form of rock [2]) formed from snow falling and accumulating over a long period of time; glaciers move very slowly, either descending from high mountains, as in valley glaciers, or moving outward from centers of accumulation, as in continental glaciers.
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