Ppt 7.1 earth

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Ppt 7.1 earth

  1. 1. Earth Science<br />7.1 Glaciers<br />
  2. 2. Ice Age<br />A period of time when much of Earth’s land is covered by glaciers<br />
  3. 3. Glaciers<br />A thick mass of ice origination on land from the compaction and recrystallization of from snow that slows evidence of past or present flow <br />
  4. 4. Snowline<br />Lowest elevation in a particular area that remains covered in snow all year<br />
  5. 5. Valley Glaciers<br />A glacier confined to a mountain valley, which in most instances had previously been a stream valley; also known as an alpine glacier<br />
  6. 6. Ice Sheet<br />Are enormous ice masses that flow in all directions from one or more centers and covered everything but the highest land<br />
  7. 7. Glacial trough<br />The once narrow V-shaped valley is changed into U-shaped <br />
  8. 8. Till<br />Sediment of different sizes deposited directly by glacier<br />
  9. 9. Stratified drift <br />Is sediment laid down by glacial meltwater<br />
  10. 10. Moraine<br />A ridge of unsorted sediment left by a glacier<br />
  11. 11. Key Concepts<br />What types of glaciers exist, and where is each type found?<br />Valley Glaciers<br />Ice Sheets<br />How do glaciers move?<br />Plastic Flow<br />Basal Slip<br />
  12. 12. What distinguishes the various types of glacial drift? <br />Weight of overlying ice and the associated pressure<br />What landscape features do glaciers form?<br />Glaciated Valleys<br />Cirques<br />Aretes and Horns<br />

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