Weathering, Rivers & Coasts

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