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Home > Art, Film & Photography > Glacial Erratics: Glacial Erratic
Glacial Erratics: Glacial Erratic

Glacial Erratics: Glacial Erratic


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Purchase includes free access to book updates online and a free trial membership in the publisher's book club where you can select from more than a million books without charge. Excerpt: A glacial erratic is a piece of rock that differs from the size and type of rock native to the area in which it rests. "Erratics" take their name from the Latin word errare, and are carried by glacial ice, often over distances of hundreds of kilometres. Erratics can range in size from pebbles to large boulders such as Big Rock (16,500 tons) in Alberta. Geologists identify erratics by studying the rocks surrounding the position of the erratic and the composition of the erratic itself. Erratics are significant because: Multiple erratics on the terminal morraine of the Okanagon Lobe. Cascade mountains in the background.The term erratic is commonly used to refer to erratic blocks, which Geikie describes as: are large masses of rock, often as big as a house, what have been transport by glacier-ice, and have been lodged in a prominent position in the glacier valleys or have been scattered over hills an plains. And examination of their mineralogical character leads the identification of their sources. In geology, an erratic is material moved by geologic forces from one location to another, usually by a glacier. Erratics are formed by glacial ice erosion resulting from the movement of ice. Glaciers erode by multiple processes: abrasion/scouring, plucking, ice thrusting and glacially-induced spalling. Glaciers crack pieces of bedrock off in the process of plucking, producing the larger erratics. In an abrasion process, debris in the basal ice scrapes along the bed, polishing and gouging the underlying rocks, similar to sandpaper on wood, producing smaller glacial till. In ice thrusting, the glacier freezes to its bed, then as it surges forward, it moves large sheets of frozen sediment at the base along with the glacier. Glacially-induced spalling occu... More: http://booksllc.net/?id=871712


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Product Details
  • ISBN-13: 9781156289761
  • Publisher: Books LLC
  • Publisher Imprint: Books LLC
  • Height: 152 mm
  • Sub Title: Glacial Erratic
  • Width: 229 mm
  • ISBN-10: 1156289769
  • Publisher Date: 31 May 2010
  • Binding: Paperback
  • Spine Width: 3 mm
  • Weight: 82 gr


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