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Natural Features and Formations
The Geology of Sand DunesJohn Mangimeli
IntroductionWhile one-quarter to one-third of the world's deserts are covered with sand, little research has taken place in ergs ...
The Nature of SandSand is defined by its size, although exact quantitative ranges vary with author. ...
Wind-induced Sand MovementIndividual sand grains are moved under the force of the wind in two distinct ways: saltation and surface creep. ...
Sand AccumulationTwo primary factors are necessary for the accumulation of sand into sand sheets and dunes: ...
Small-scale Sand Accumulation FeaturesOnce sand grains have accumulated into relatively large sandy patches, small-scale geomorphic features will often ...
Large-scale Sand Accumulation FeaturesAccording to Bagnold (1941), certain conditions must be met for flat sandy areas to build up into true dunes.