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Sec 1 Exp - Weathering
Sec 1 Exp - Weathering
Sec 1 Exp - Weathering
Sec 1 Exp - Weathering
Sec 1 Exp - Weathering
Sec 1 Exp - Weathering
Sec 1 Exp - Weathering
Sec 1 Exp - Weathering
Sec 1 Exp - Weathering
Sec 1 Exp - Weathering
Sec 1 Exp - Weathering
Sec 1 Exp - Weathering
Sec 1 Exp - Weathering
Sec 1 Exp - Weathering
Sec 1 Exp - Weathering
Sec 1 Exp - Weathering
Sec 1 Exp - Weathering
Sec 1 Exp - Weathering
Sec 1 Exp - Weathering
Sec 1 Exp - Weathering
Sec 1 Exp - Weathering
Sec 1 Exp - Weathering
Sec 1 Exp - Weathering
Sec 1 Exp - Weathering
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Sec 1 Exp - Weathering

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Transcript

  • 1. Weathering
  • 2.  
  • 3.  
  • 4.  
  • 5. What is weathering?
    • A process by which rocks are progressively broken down into fragments where they are .
  • 6.  
  • 7.  
  • 8. What happened to the rock?
  • 9. What happened to the rock?
  • 10. What happened to the rock?
  • 11. Exfoliation (Onion skin) weathering
    • Large changes in temperature
      • Heats causes the surface layer of the rock to expand during the day.
      • However, the inside of the rock remains cool as rock is a bad conductor of heat.
      • During the night, the surface cools faster than the interior so it also contracts more.
      • This constant expansion and contraction weakens the surface of the rock.
  • 12.  
  • 13.  
  • 14.
      • Rainwater combines with carbon dioxide in the air to form an acid (carbonic acid) which dissolves certain types of rocks such as limestone.
    Carbonation (Action of water)
  • 15. Can you see the gap in between the rocks?
  • 16.  
  • 17. Frost shattering (Freezing water)
      • Water from melting snow or rain may enter cracks in rocks.
      • When water freezes at night, it expands.
      • The ice then exerts pressure on the walls of the cracks, pushing them apart.
      • During the day, the ice melt and turn back into water.
      • This alternate freezing of water and melting of ice causes the cracks to become wider.
  • 18.  
  • 19. What happened to the pavement?
  • 20. What had happened?
  • 21. Biological weathering (plant growth)
    • The wind may deposit seeds into the cracks of rocks.
    • As seeds grow into plants, the roots grow into the rocks
    • Force the cracks in the rock to widen.
    • Overtime, the entire rock can fall apart if the force is strong enough.
  • 22.  
  • 23.  
  • 24. What are the four different types of weathering?
    • Exfoliation
    • Carbonation
    • Frost shattering
    • Biological weathering (Plant growth)

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