7.1 Glaciers
Ice Age• A period of time when much of Earth’s land is  covered by glaciers.
Glacier• A thick mass of ice originating on land from  the compaction and recrystallization of snow  that shows evidence o...
Snowline• Lowest elevation in a particular area that  remains covered in snow all year.
Valley Glacier• A glacier confined to a mountain valley, which  in most instances had previously been a  stream valley.
Ice sheet• Enormous ice masses that flow in all  directions from one or more centers and cover  everything but the highest...
Till• Sediment of different sizes deposited directly  by a glacier
Moraine• A ridge of unsorted sediment left by a glacier
Glacial trough• V-shaped or U-shaped valley cut by glacial  movement.
Key Concept• A valley glacier is a stream of ice that flows  between steep rock walls from a place near  the top of the mo...
Key Concept• Ice sheets are sometimes called continental  ice sheets because they cover large regions  where the climate i...
Key Concept• The movement of glaciers is referred to as  flow. Glacial flow happens two ways : plastic  flow and basal slip.
Key Concept• The glacial budget is the balance or lack of  balance between accumulation at the upper  end of a glacier and...
Key Concept• Many landscapes were changed by the  widespread glaciers of the recent ice age.
Key Concept• Glaciers are responsible for a variety of  erosional landscape features, such as glacial  troughs, hanging va...
Key Concept• Glacial drift applies to all sediments of glacial  origin, no matter how, where, or in what form  they were d...
Key Concept• Glaciers are responsible for a variety of  depositional features, including moraines,  outwash plains, kettle...
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Earth science 7.1

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Earth science 7.1

  1. 1. 7.1 Glaciers
  2. 2. Ice Age• A period of time when much of Earth’s land is covered by glaciers.
  3. 3. Glacier• A thick mass of ice originating on land from the compaction and recrystallization of snow that shows evidence of past or present flow
  4. 4. Snowline• Lowest elevation in a particular area that remains covered in snow all year.
  5. 5. Valley Glacier• A glacier confined to a mountain valley, which in most instances had previously been a stream valley.
  6. 6. Ice sheet• Enormous ice masses that flow in all directions from one or more centers and cover everything but the highest land.
  7. 7. Till• Sediment of different sizes deposited directly by a glacier
  8. 8. Moraine• A ridge of unsorted sediment left by a glacier
  9. 9. Glacial trough• V-shaped or U-shaped valley cut by glacial movement.
  10. 10. Key Concept• A valley glacier is a stream of ice that flows between steep rock walls from a place near the top of the mountain valley
  11. 11. Key Concept• Ice sheets are sometimes called continental ice sheets because they cover large regions where the climate is extremely cold. They are huge compared to valley glaciers.
  12. 12. Key Concept• The movement of glaciers is referred to as flow. Glacial flow happens two ways : plastic flow and basal slip.
  13. 13. Key Concept• The glacial budget is the balance or lack of balance between accumulation at the upper end of a glacier and loss, or wastage, at the lower end.
  14. 14. Key Concept• Many landscapes were changed by the widespread glaciers of the recent ice age.
  15. 15. Key Concept• Glaciers are responsible for a variety of erosional landscape features, such as glacial troughs, hanging valleys, cirques, arêtes, and horns.
  16. 16. Key Concept• Glacial drift applies to all sediments of glacial origin, no matter how, where, or in what form they were deposited. There are two types of glacial drift: till and stratified drift.
  17. 17. Key Concept• Glaciers are responsible for a variety of depositional features, including moraines, outwash plains, kettles, drumlins, and eskers.

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