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Chapter 17. Glaciers. 1. Glacier. A large mass of moving ice. 2. Alpine Glacier . a narrow, wedge-shaped mass of ice that forms in a mountainous region and that is confined to a small area by surrounding topography ; examples include valley glaciers, cirque glaciers,

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chapter 17

Chapter 17

Glaciers

1 glacier
1. Glacier

A large mass of moving ice.

2 alpine glacier
2. Alpine Glacier
  • a narrow, wedge-shaped mass of
  • ice that forms in a mountainous
  • region and that is confined to a
  • small area by surrounding
  • topography; examples include
  • valley glaciers, cirque glaciers,
  • and piedmont glaciers.
3 continental glaciers
3. Continental Glaciers
  • massive sheet of ice that may
  • cover millions of square
  • kilometers, that may be
  • thousands of meters thick, and
  • that is not confined by
  • surrounding topography.
4 basal slip
4. Basal Slip

process that causes the ice at

the base of a glacier to melt

and the glacier to slide.

5 internal plastic flow
5. Internal Plastic Flow
  • the process by which glaciers
  • flow slowly as grains of ice
  • deform under pressure and
  • slide over each other.
6 crevasse
6. Crevasse

in a glacier, a large crack or

fissure that results from ice

movement.

7 cirque
7. Cirque
  • a deep and steep bowl-like
  • depression produced by
  • glacial erosion.
8 arete
8. Arete

a sharp, jagged ridge that

forms between cirques.

9 horn
9. Horn

a sharp, pyramid-like peak

that forms because of the

erosion of cirques.

10 erratic
10. Erratic
  • a large rock transported
  • from a distant source by a
  • glacier.
11 glacial drift
11. Glacial Drift

rock material carried and

deposited by glaciers.

12 till
12. Till

unsorted rock material that

is deposited directly by a

melting glacier.

13 moraine
13. Moraine

a landform that is made from

unsorted sediments deposited

by a glacier.

14 kettle
14. Kettle
  • a bowl-like depression in a
  • glacial drift deposit.
15 esker
15. Esker
  • a long, winding ridge of gravel
  • and coarse sand deposited by
  • glacial melt water streams.
16 ice age
16. Ice Age

a long period of climatic

cooling during which the

continents are glaciated

repeatedly.

17 milankovitch theory
17. Milankovitch Theory
  • the theory that cyclical
  • changes in Earth’s orbit and
  • in the tilt of earth’s axis occur
  • over thousands of years and
  • cause climatic changes.
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