1. 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 F.Ciangura

6. Roots of tree breaks rock apart 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

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

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

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

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

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

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

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

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

27. Antelope Canyon F.Ciangura

28. Antelope canyon ( in Arizona ) is formed over the course 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. USA Mexico F.Ciangura

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

31. Side of mountain is eroded F.Ciangura

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

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

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

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

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

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

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

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

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

50. Upper Course Middle Course Lower Course F.Ciangura

52. Uppercourse- water moves fast and erodes F.Ciangura

54. Effects of river erosion F.Ciangura

55. Waterfall F.Ciangura

56. The highest waterfall in the world is the Angel Falls in Venezuela (see picture right) which have a drop of 979m. Other particularly famous examples include Niagara Falls (North America), the Victoria Falls (on the Zambia / Zimbabwe border) and the Iguazu Falls (South America). F.Ciangura

57. Victoria Falls F.Ciangura

58. Middle course- Erosion and deposition take place F.Ciangura

63. Meanders and ox-bow lakes

64. F.Ciangura meander Ox bow lake F.Ciangura

65. Lower course- Water moves slowly and deposits the load F.Ciangura

67. Silt is deposited F.Ciangura

68. Nile delta: Silt is deposited here River Nile Mediterranean sea F.Ciangura

70. http://www.classzone.com/books/earth_science/terc/content/visualizations/es1305/e s1305page01.cfm?chapter_no=visualizationhttp://www.classzone.com/books/earth_science/terc/content/visualizations/es1305/e s1305page01.cfm?chapter_no=visualization http://www.bbc.co.uk/schools/ks3bitesize/sci ence/chemistry/rock_cycle_intro.shtml http://www.uky.edu/AS/Geology/howell/goodies/ http://library.thinkquest.org/20035/river.htm http://highered.mcgraw-hill.com/sites/0072402466/student_view0/chapter10/animations_and_movies.html#

71. F.Ciangura River erosion…