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Glaciated Landscapes 2 (after glaciation (a winding river valley would be…
Glaciated Landscapes 2
slides
occur when an entire mass of material moves downwards along a straight line slip until it impacts the bottom of slope
slides may occur due to steepening or undercutting of valley sides by erosion at the base of the slope
slumps a.k.a steps
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this leaves back a series of steps, this will usually occur where weak rock is present, such as clay
rockfalls
occur at steeper reliefs, often over 70 degrees
bare rock can become detaches from the slope by physical weathering processes, therefore the rock falls to the foot of the slope under gravity forming scree
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en-glacial debris - carried within the glacier. comes from the surface debris which has fallen down a crevasse; or sunken into the glacier from localized pressure melting; or buried by snowfall
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arete
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this means that the land between them gets narrower, forming a knife edge ridge rocky and crenelated
pyramidal peak
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the mountain has a horn-shaped summit which is angular and sharply pointed. the summit has steep sides, which are usually the backwalls of corries
several aretes radiate from the central peak. for example: the Matterhorn in Switzerland, this peak is over 1,200m high
after glaciation
a winding river valley would be changed into a straight, deep glacial valley.
the interlocking spurs of the river valley are removed by the erosive power of the glacier to form truncated spurs
the v-shaped cross section of the river valley is replaced by a wider u-shaped cross-section this is due to the erosive power of the glacier
the river now occupying the valley is called a misfit stream because it is not large enough to have eroded the valley itself
truncated spurs - a steep wall on the side of a glaciated valley between two tributary valleys. it marks the point where a glacier has eroded through a former hillside spur
ribbon lake - occupies a rock basin, on the floor of the glacial trough. post glacial melt-water fills the rock basin, which may also be damned by a depositional material