Rocks and Weathering

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Introduction to rocks and weathering. Physical weathering including freeze-thaw and heating and cooling.

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Rocks and Weathering

  1. 1. How could weathering break down the rocks into small pieces?
  2. 2. Rocks and Weathering <ul><li>Learning Objectives : </li></ul><ul><li>To understand the terms ‘Physical weathering’, ‘Heating and cooling’, ‘Freeze-thawing’ and ‘Erosion’ and their effects on rocks. </li></ul><ul><li>To explain what happens during physical weathering and that no new substance is made. </li></ul><ul><li>To know some examples of where physical weathering occurs. </li></ul>
  3. 3. Practical Activity <ul><li>Safety First: </li></ul><ul><li>Wear safety goggles </li></ul><ul><li>Stand up </li></ul><ul><li>Tuck your chair & bags under your desk </li></ul><ul><li>Tie back long hair </li></ul>
  4. 4. Investigation <ul><li>Investigate the effects of heating and cooling by heating up a piece of marble/limestone. </li></ul><ul><li>What happens after heating the marble? </li></ul><ul><li>The piece crumbles into smaller pieces. </li></ul>
  5. 5. What is happening?
  6. 7. 8G Freeze-thaw
  7. 8. Weathering by ice “ Onion skin” weathering
  8. 9. Tell me why.... <ul><li>Why do mountaineers climbing mountains start early in the morning and try to complete their climb on mountain faces before midday? </li></ul><ul><li>Explain why rock falls are a major hazard to climbing. </li></ul>
  9. 10. Rocks and Weathering <ul><li>Learning Objectives : </li></ul><ul><li>To understand the terms ‘Physical weathering’, ‘Heating and cooling’, ‘Freeze-thawing’ and ‘Erosion’ and their effects on rocks. </li></ul><ul><li>To explain what happens during physical weathering and that no new substance is made. </li></ul><ul><li>To know some examples of where physical weathering occurs. </li></ul>

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