sci 245 study notes

Apr 18th, 2015
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Deserts have a variety of landscape features to display. Weathering and erosion play a big part of many of these features and landforms; this produces such forms as plateaus, mesas, and buttes a function of rock structure. Some of these rocks have hardness s and strengths depending on the weathering rate. Many have fantastic structures that tend to have angular features, due to the lack of rainfall, therefore minimal chemical weathering. Though rainfall is not a common feature of the deserts, flashfloods form temporary rivers, that carve scapes, and steep sided valley s and gullies. Playas which are formed from flashfloods accumulate in shallow depressions in the desert floor. Playa lakes disappear usually very quickly, they leave behind sand, silt and dissolved minerals which may form salt flats, such as the Dead Sea in Israel, Jordan, and the Great Lakes in Utah. Commonly thought of as a typical desert are sand dunes, which have distinctive desert landscape features. These sand dunes only occupy a relatively small portion of the world s deserts. Some of the larger features have a structure that can be interpreted to indicate predominant wind direction. Sand and silt that are dep

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