COLD: Ice Movement Flashcards

1
Q

Movement of cold based glaciers? (5)

A
  • Occur in polar latitudes
  • Glacier remains well below freezing
  • Ice remains frozen to the bedrock
  • Very little ice movement
  • Limited erosion
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2
Q

Movement of warm based glaciers? (4)

A
  • Most glaciers outside of Antarctica and Northern ice-caps
  • Water present throughout ice mass, acts as a lubricant
  • Movement of between 20-200 metres a year
  • Increases capacity of glacier to erode bedrock
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3
Q

What is pressure melting point? (3)

A
  • Temperature at which ice is on the verge of melting
  • At the surface of glacier is at 0 degrees
  • Lower within glacier because ice is under pressure, so melts easily
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4
Q

What is internal flow? (2)

A
  • Movement within glacier ice, resulting from stresses by force of gravity
  • Ice crystals orientate themselves in direction of glacier’s overall movement
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5
Q

What is basal slippage? (5)

A
  • Sliding effect of glacier
  • Increasing pressure in lower ice causes pressure melting
  • Meltwater permits slippage of ice over obstacles
  • Refreezes in lower pressure conditions on down glacier side
  • Creep may occur when little or no regelation slip
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