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Weathering, Rivers & Coasts PowerPoint Presentation
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Weathering, Rivers & Coasts

Weathering, Rivers & Coasts

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Weathering, Rivers & Coasts

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  1. Weathering, Rivers & Coasts F.Ciangura F.Ciangura

  2. F.Ciangura F.Ciangura

  3. Biological Onion-Skin Exfoliation Weathering Freeze-Thaw/ Frost Shattering Chemical F.Ciangura F.Ciangura

  4. Rocks break due to action of plants and animals. • Seeds get in rock • Seeds grow into plants • Cracks widen as roots grow • Rock breaks up Biological Weathering F.Ciangura F.Ciangura

  5. F.Ciangura F.Ciangura

  6. Roots of tree breaks rock apart F.Ciangura F.Ciangura

  7. Onion-Skin Weathering / Exfoliation F.Ciangura F.Ciangura

  8. During the day the sun heats the rocks. The outer layer of the rock expands by heat. At night it gets cooler and the outer layer of rock shrinks back to its original place F.Ciangura F.Ciangura

  9. The outer layer of rock peels off F.Ciangura F.Ciangura

  10. F.Ciangura F.Ciangura

  11. Freeze-Thaw Weathering/ Frost Shattering F.Ciangura F.Ciangura

  12. When water freezes it expands by 30% Glass bottle has cracked!!! F.Ciangura F.Ciangura

  13. F.Ciangura F.Ciangura

  14. F.Ciangura F.Ciangura

  15. Frost shattering/ freeze-thaw weathering also cracks window sills and water pipes in very cold countries! F.Ciangura F.Ciangura

  16. Chemical Weathering F.Ciangura F.Ciangura

  17. Pollution Chemicals mix with moisture In clouds ACID RAIN F.Ciangura F.Ciangura

  18. F.Ciangura F.Ciangura

  19. Chemicals in rain dissolve limestone F.Ciangura F.Ciangura

  20. Wind Sea Erosion Rivers Ice F.Ciangura

  21. Wind F.Ciangura F.Ciangura

  22. How does the wind erode? Wind carries sand which is very abrasive. F.Ciangura F.Ciangura

  23. F.Ciangura F.Ciangura

  24. Wind +sand Hard rock Wind +sand Soft rock Soft rock is eroded more than the hard rock F.Ciangura F.Ciangura

  25. F.Ciangura F.Ciangura

  26. Andes Mountains (4000m above sea level) Rock sculpted by wind, Utah. F.Ciangura F.Ciangura

  27. Antelope Canyon F.Ciangura F.Ciangura

  28. USA Mexico Antelope canyon (in Arizona) is formed over thecourse of millions of years by erosion of the surrounding sandstone (in this case, Navajo Sandstone), primarily due to flash flooding and secondarily due to wind erosion. F.Ciangura F.Ciangura

  29. Ice F.Ciangura F.Ciangura

  30. A glacier is a frozen river found at the top part of mountains Glacier moves down a mountain side F.Ciangura F.Ciangura

  31. Side of mountain is eroded F.Ciangura F.Ciangura

  32. F.Ciangura F.Ciangura

  33. When a glacier moves down a mountain, it erodes a wide U-shaped valley. F.Ciangura F.Ciangura

  34. The ice that makes up the glacier is heavy So, this ice scrapes off the sides of the mountain like a sandpaper F.Ciangura F.Ciangura

  35. F.Ciangura F.Ciangura

  36. F.Ciangura F.Ciangura

  37. F.Ciangura F.Ciangura

  38. Sea F.Ciangura F.Ciangura

  39. How the sea erodes a headland headland sea F.Ciangura F.Ciangura

  40. Waves continuously hit the cliffs and erode Cliff sides. (Venus Bay, South Australia). F.Ciangura F.Ciangura

  41. Cliff Retreat: The sea erodes the bottom of the cliff, which then falls down. The cliff, thus moves back Cliff F.Ciangura F.Ciangura

  42. Wavecut platform: a geological feature caused by the sea's erosion of cliffs, seen at Southerndown, South Wales. F.Ciangura F.Ciangura

  43. F.Ciangura F.Ciangura

  44. Rivers F.Ciangura F.Ciangura

  45. Rivers erode the rock, transport the material called load, and when the water does not have any More energy, they depost the load to form new landforms. F.Ciangura

  46. Rivers erode the rock River is brown as it transports the load (soil…) F.Ciangura F.Ciangura

  47. Deposition Deposition is the opposite of erosion. Deposition is where a river lays down or drops the sediment or material that it is carrying. Deposition F.Ciangura F.Ciangura

  48. F.Ciangura F.Ciangura

  49. Rivers transport the material called load F.Ciangura F.Ciangura

  50. Upper Course Middle Course Lower Course F.Ciangura F.Ciangura