Weathering
 
 
 
What is weathering? <ul><li>A process by which rocks are progressively broken down into fragments where they are .  </li><...
 
 
What happened to the rock?
What happened to the rock?
What happened to the rock?
Exfoliation (Onion skin) weathering <ul><li>Large changes in temperature </li></ul><ul><ul><li>Heats causes the surface la...
 
 
<ul><ul><li>Rainwater combines with carbon dioxide in the air to form an acid (carbonic acid) which dissolves certain type...
Can you see the gap in between the rocks?
 
Frost shattering (Freezing water) <ul><ul><li>Water from melting snow or rain may enter cracks in rocks. </li></ul></ul><u...
 
What happened to the pavement?
What had happened?
Biological weathering (plant growth) <ul><li>The wind may deposit seeds into the cracks of rocks. </li></ul><ul><li>As see...
 
 
What are the four different types of weathering? <ul><li>Exfoliation </li></ul><ul><li>Carbonation </li></ul><ul><li>Frost...
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Sec 1 Exp - Weathering

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Sec 1 Exp - Weathering

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

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