Flashcards
Glaciation
Cards in this deck (6)
- 1What is an ice sheet?An ice sheet is a large moving mass of ice which covers an entire land surface.
- 2What is a valley glacier?A valley glacier is a moving mass of ice confined within a valley.
- 3What is abrasion?A process of erosion in which rocks carried in the bottom of the glacier act as erosive agents for the glacier. These rocks scrape against rocks beneath them like sandpaper. Abrasion can leave some rock surface polished and other engraved with deep striations.
- 4What is plucking?The main erosive process of a glacier. When ice melts in the bottom of a glacier and trickles into cracks between rocks. This water re-freezes and when the glacier moves it rips the rocks out. Those rocks are often used in abrasion. Plucking leaves behind jagged landscape.
- 5What is freeze-thaw weathering?Freeze-thaw is when water enters cracks in the rock during the day and freezes in the night when the temperature drops. As it freezes, it expands. The expanded ice places pressure on the rocks around it. Over time this pressure causes the rock to crack and split.
- 6What is an arete?
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- Flashcards on Glaciation, created by Reviser11 on 06/03/2016.
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- Reviser11
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