Deserts a Global Ecosystem

1. Deserts http:// au.youtube.com/watch?v =rA89xxCzrm8 Intro vid to music Intro Flash vid to Jack Johnson music http:// blip.tv/scripts/flash/blipplayer.swf?autoStart = false&file =http://blip.tv/file/get/Adtastic2001-Deserts994.flv?source=3

8. 24 Deserts Game http://www.purposegames.com/game/111

17. Dominance of high pressure systems Deserts & winds

18. Deserts: where & why Deserts & winds

19. Deserts: where & why Deserts & winds

22. Flash of atmospheric circ http://www.school-portal.co.uk/GroupDownloadFile.asp?GroupId =12426&ResourceID=40425

25. Australia's deserts, listed below, are distributed throughout the western plateau and interior lowlands. The total desert area equates to 18% of the total mainland area of Australia.

27. Orographic Rainfall The dry air mass becomes warmer, with little chance of rain. Deserts are often found on the leeward side of large mountain ranges Warm moist air approaches a mountain barrier The air mass is forced to rise as it hits the mountain and condenses into clouds Orographic rainfall occurs on the windward side of the mountains The air mass, now drier, flows down the leeward side of the mountains

28. Orographic Rainfall The dry air mass becomes warmer, with little chance of rain. Deserts are often found on the leeward side of large mountain ranges Warm moist air approaches a mountain barrier The air mass is forced to rise as it hits the mountain and condenses into clouds Orographic rainfall occurs on the windward side of the mountains The air mass, now drier, flows down the leeward side of the mountains

35. Task : Construct a climate graph for Wadi Halfa

38. A sandy desert or an erg surface A stony desert or an reg surface (known as a gibber plain in Australia) A rocky desert or hamada surface

41. Using pg 255 of the text draw and Annotate and label All 4 sand dunes in figure 12.2e Use the heading Sand Dunes. Then read p254 and describe the 4 types of dunes

43. Transverse dunes

44. Reg or stony desert

45. Erg or sandy desert

46. Inselbergs

47. Barchan dune

48. Star dunes

49. Alluvial fan

50. Arch Animation http://www.classzone.com/books/earth_science/terc/content/visualizations/es1601/es1601page01.cfm?chapter_no=visualization

51. Butte

52. Badlands

54. Photo 1 – Monumental hills

55. Photo 2 The mountains above a stream

56. Photo 3 – sand and sky

57. Photo 4 – “Badlands landscape”

58. Photo 5 The archway

60. Here is what one pupil thought! They all look rather mountainous with exposed rock and very steep slopes. I put these three together – I think!

61. These photos seemed to form another group They both have flat areas which are kind of bumpy – but not seriously mountainous like the others?

67. Desert Keyword Quiz 10 Questions

68. Name the landform 1

69. What type of desert is Mr Anderson in? 2

70. Name the landform 3

71. Name the landform 4

72. Name the landform 5

73. Name the landform 6

74. Name the landform 7

75. What type of desert is this? 8

76. Name the landform 9

77. Name the landform 10

78. Desert Keyword Quiz 10 ANSWERS

79. Name the landform 1 wadi

80. What type of desert is Mr Anderson in? 2 erg

81. Name the landform 3 alluvial fan

82. Name the landform 4 mesa

83. Name the landform 5 sand dune

84. Name the landform 6 butte

85. Name the landform 7 escarpment

86. What type of desert is this? 8 reg

87. Name the landform 9 oasis

88. Name the landform 10 playa

89. DESERT ANIMALS

95. DESERT PLANTS

97. Photosynthesis takes place in the green stem (the cactus has no leaves) Thick cell walls that do not break when they dry out A thick, waxy coating keeps the water inside the cactus from evaporating. Instead of leaves, most cacti have spines or scales (which are modified leaves). These spines and scales do not lose water through evaporation (unlike regular leaves, which lose a lot of water). The spines protect the cactus from predators (animals that would like to eat the cactus to obtain food and/or water)