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IB Geography (HL)
Extreme environments
IB Geography Hot Arid Desert Landforms
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Geography
IB Geography (HL)
Extreme environments
11th
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9 Terms
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Dunes
Loose sand transported by saltation, suspension, and surface creep → obstruction → sand accumulates on leeward side
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Wadis
Dry gullies/river beds eroded by flash floods
Heavy rainstroms(100-250mm) create torrents on steep slopes
Wadi Rum, Jordan
3
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Deflation
Wind creates blowout
Creates oasis if it erodes below water table
Qattara Depression in Egypt → 122m below sea level
4
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Alluvial Fans
Bottom of desert mountains, streams spread out, deposit transported material
5
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Rock Pedastals
Sedimentary rock → more and less resistant
Wind can only lift sand 1.5m off the ground → mushroom blocks
6
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Mesas and Buttes
Relic hills isolate by water erosion, horizontally bedded sedimentary rock, more resistant cap stone on top
M = wider than tall
B = taller than wide
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Desert Erosion
Largely wind, some water
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Weathering
Temperature change weathering, chemical weathering (oxidation), mechanical weathering
9
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Deposition
Wind and water
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