Unit 1A - Weathering

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  • Weathering
    • Mechanical Weathering
      • Freeze-Thaw
        • In some areas the temperature is above 0 degrees during the day and below 0 degrees at night
          • During the day water gets into the cracks
            • At night the water freezes and expands
              • The water thaws the next day then freezes the next night
                • Repeated freezing and thawing widens the cracks and causes the rock to break
      • Exfoliation
        • Some areas have a big daily temperature range
          • Each day the surface layers of rock heat up and expand further than the inner layers
            • At night the surface layers cool down and contract faster than the inner layers
              • This creates pressure within the rock and causes thin surface layers to peel off
    • Chemical Weathering
      • Solution
        • Some minerals that make up rocks are soluble in water for example rock salt
          • The minerals dissolve in rainwater, breaking the rock down
      • Carbonation
        • Rainwater has carbon dioxide in it, which makes it a weak carbonic acid.
          • Carbonic acid reacts with rocks that contain calcium carbonate such as carboniferous limestone


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