Desert Desert key terms etc 2.0 / 5 based on 2 ratings ? GeographyRock landscapes and processesGCSEAll boards Created by: lolCreated on: 03-05-12 19:48 Mesa A flat table-like small land with steep edges 1 of 13 Abrasion Wearing down of rock particles by friction due to water or wind or ice. 2 of 13 Flash Flood The result of heavy or excessive amounts of rainfall within a short period of time 3 of 13 Wadi Steep-sided valley 4 of 13 Freeze-thaw weathering Water - eg from rainfall or melting snow and ice - becomes trapped in a crack or joint in the rock. If the temperature drops below freezing, the water will freeze and put pressure on the rock. The ice will melt when the temperature rises above freezing. If this process happens repeatedly, the rock will weaken and eventually shatter. 5 of 13 Deflation Process where wind erosion creates blowout depressions. 6 of 13 Weathering Processes by which rocks exposed to the weather undergo changes in character and break down. 7 of 13 Desert arch Deep cracks penetrate into a sandstone layer. Erosion wears away exposed rock layers and enlarges the surface cracks, isolating narrow sandstone walls. The resulting holes become enlarged to arch proportions by rockfalls and weathering. 8 of 13 Mushroom Rock Resembles like a mushroom, caused by wind erosion which progresses at a different rate at its bottom to that at its top. 9 of 13 Sand Dune A hill or ridge of sand accumulated and sorted by wind action. 10 of 13 Yardang Wind-sculptured hill-like rock 11 of 13 Plateau Land of uneven rocks 12 of 13 Salt pan A shallow pool of a depression in which water gathers and leaves a deposit of salt caused by evaporation 13 of 13
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