Weathering Rocks

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  • Created by: Ash
  • Created on: 13-04-13 11:20
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  • Weathering
    • Mechanical
      • Freeze Thaw Weathering
        • 1.  Some temperatures are above 0? C at day but below at night.
        • 2. In the day, water get into a crack of rocks.
        • 3. At night, the water freezes and expands - pressure is on the rock
        • 4.  Water thaws the next day and refreezes the next night.
        • 5. Repitition of this creates more cracks and breaks the rock.
      • Exfoliation
        • 1. Big daily temperature ranges
        • 2. In the  day, the surface layers heat up and expand.
        • 3.  In the night, the surface layers cool  down and contacts
        • 4. This  creates pressure within the rock and causes the thin  layers to peel off.
    • Chemical
      • Solution
        • Minerals within the rock can dissolve in water.
        • These minerals can dissolve in rainwater.
      • Carbonation
        • Rain water  consists of carbon dioxide.
          • This makes it a  weak carbonic acid.
            • Carbonic acid reacts with rocks that contain calcium carbonate.
              • Rocks such as carboniferous limestone are dissolved by rainwater.
    • Biological Weathering
      • Breakdown of rocks by living things.
        • Plant roots break down rocks by growing into cracks on their surfaces and pushing them apart.
        • Burrowing animals may loosen small amounts of rock material.
  • Burrowing animals may loosen small amounts of rock material.

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