glacial landforms

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  • glacial landforms
    • corries
      • A corrie is an armchair shaped hollow, high on a mountain with steep back and side walls.
    • arete
      • an arete is a steep-sided ridge - its formed when two glaciers flow in parrallel valleys. the glaciers erode the sides of the valley, which sharpens the mountain ridge in between them.
    • pyramidal peak
      • a pyramidal peak is a pointed mountain peak with at least three sides. it forms where three or more corries form back to back
    • u-shaped valleys
      • steep sifed valleys with flat bottoms. there formed by erosion of a v-shaped valley by a glacier. as the glacier erodes through the v-shaped valley it makes them deeper and wider
    • truncated spurs
      • truncated spurs are formed when ridges of land (spurs) stick out into the main valley are chopped off (truncated) as the main valley glacier moves past.
    • tarns
      • tarns are lakes that form in corries after a glacier has retreated.
    • fjords
      • fjords are long, deep inlets that form when a valley thats been erroded by a glacier is flooded by sea level rise after the ice has melted
    • rôche  moutonnée
      • a rock formation created by the passing of a glacier. The passage of glacier ice over underlying bedrock often results in asymmetric erosional forms as a result of abrasion on the "stoss" (upstream) + (smooth side) side of the rock and plucking on the "lee" (downstream) (rough) side.
    • moraines are parallel ridges of debris/till deposited along the glacier.
      • lateral - down the sides, debris/till from cliffsides
      • medial - debris/till down the centre, from erosion further up the glacier
      • terminal - build up at the end of the glacier, and is deposited as semicircular hillocks of till

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