ice on land

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  • Definitions
    • Ice on the land
      • How do glaciers shape the landscape?
        • Weathering- is the break down of rocks
          • Freeze thaw weathering
            • 1. Water fills crack in the rock
              • 2. The water freezes so crack widens. Volume of water expands when it freezes so the crack is pushed and widened
                • 3. Repeated freeze thaw action increases size of crack until rock breaks off
        • Erosion- is the wearing away of landscape
          • Abrasion- sandpaper effect caused by weight of the ice scouring the valley floor and sides using angular rock material trapped underneath
            • results in a smooth, shiny surface
          • Plucking
            • 1. When meltwater beneath a glacier freezes, bonds glacier base to the rocky surface below
              • 2. As the glacier moved any loose fragments of rock are plucked away
                • 3.leaves behind jagged rocky surface
        • Plucking
          • 1. When meltwater beneath a glacier freezes, bonds glacier base to the rocky surface below
            • 2. As the glacier moved any loose fragments of rock are plucked away
              • 3.leaves behind jagged rocky surface
      • Causes of Avalanches
        • Heavy Snowfall
        • Heavy Rainfall
        • Tree Romoval
        • Human Factors
        • Steep Slopes
    • Ice Cap
      • A small body of ice (less than 50000km2) usually found in mountainous regions
    • The second largest ice sheet on the earth is Greeland
    • The snout is the front or lowest part of glacier
    • The Largest ice sheet on earth is ANTARCTICA
    • The outputs from glacier budget, such as melting and evaporation is ABLATION
      • The inputs into the glacier budget such as snowfall and avalanches is accumulation
    • is a finger of ice usually extending downhill from an ice cap and occuping a valley
    • Glacier
    • ice sheet
      • a large body of ice completely covering an area of land greater than 50000km
  • Avalanches
    • Are masses of snow,ice and rocks that move downhill at high speeds
    • Slab Avalanches are more deadly
    • Loose snow Avalanches involve powerdery snow and loose.
  • Corrie
    • Is a circular rock hollow usually located on a mountainside
    • It has a steep and rocky back wall leading to sharp rocky ridges called ARETES
    • The front of a corrie is open with a ROCK lip
    • After the ice has melted the hollow is usually filled with a small round lake called a TARN
  • Formation of a corrie
    • Freeze thaw action
    • Plucking
    • Abrasion
    • Rotational Slip

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