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Flashcards in Glacial ice Deck (2)
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1
Q

Lower zone

A
  • Zone of plastic flow
  • Steady pressure
  • Meltwater resulting from pressure + friction with bedrock = more rapid flow (plastic)
  • Depth in glacier, meltwater point of ice is raised slightly = increased pressure
  • Moulds like plastic
  • Doesn’t flow in a uniform way
  • Different speeds
2
Q

Upper zone

A
  • Rigid zone
  • Great rigidity and strength
  • Brittle, which breaks apart to form crevasses
  • Moves in a uniform way at the same speed.