Moraines and permafrost
- Created by: Ali Bland
- Created on: 17-03-15 19:36
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- Moraines
- Lateral
- Ridges of moraine that come from the valley sides and run parallel to those valley sides
- Medial
- Formed when a tributary glacier joins the main glacier and two lateral moraines join up
- Terminal
- Rocks deposited in a ridge at the maximum advance of the ice
- Englacial
- Any material trapped within the ice. Includes material that has fallen down crevasses and the rocks being scraped along the valley floor
- Ground
- Moraine spread all over the ground as a glacier retreats up valley in warmer times
- Lateral
- Permafrost
- Permafrost is permanently frozen ground
- The thickness of the permafrost decreases as the distance from the Arctic increases
- The upper surface of the permafrost's called the permafrost table
- The top few centimetres of soil may temporally melt during the summer when temperature rises above 0°C. This is called the active layer
- In the winter the active layer refreezes
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