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Creat Glog About:"Deserts"

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-The original meaning of the word desert is ''anabandoned place'' -Around one third of theEarths' surface is coveredin deserts.-Only around 20% of the deserts on Earthare covered in sand.

Deserts- a region so arid because of little rainfall that it supports only sparse and widely spaced vegetation or no vegetation at all.

Dune- A dune is a hill made of sand.

desert floor- The desert floor is the flat ground in a desert.

Primarily climatic variations and human activities is the cause of desertification. Degradation of land in arid, semi-arid and dry sub-humid areas are all included in Desertification. The malfunction of dry land ecosystems is the main cause of desertification.

Case Study-http://www.ccsenet.org/journal/index.php/jsd/article/viewFile/9646/7737Learn More Information-http://environment.nationalgeographic.com/environment/habitats/desert-profile/-http://www.ucmp.berkeley.edu/exhibits/biomes/deserts.php

Work Cited"The Desert Biome." The Desert Biome. California Academy of Sciences, 2004. Web. 13 May 2014."Deserts National Geographic." National Geographic. N.p., n.d. Web. 14 May 2014.Dictionary.com. Dictionary.com, n.d. Web. 14 May 2014."Desert." - Wikipedia, the Free Encyclopedia. N.p., n.d. Web. 16 May 2014.

A desert is a barren area of land where little precipitation occurs and consequently living conditions are hostile for plant and animal life. The lack of vegetation exposes the unprotected surface of the ground to the processes of denudation. About one third of the land surface of the world is arid or semi-arid. This includes much of the polar regions where little precipitation occurs and which are sometimes called "cold deserts". Deserts can be classified by the amount of precipitation that falls, by the temperature that prevails, by the causes of desertification or by their geographical location.Deserts are formed by weathering processes as large variations in temperature between day and night put strains on the rocks which consequently break in pieces. Although rain seldom occurs in deserts, there are occasional downpours that can result in flash floods. Rain falling on hot rocks can cause them to shatter and the resulting fragments and rubble strewn over the desert floor is further eroded by the wind. This picks up particles of sand and dust and wafts them aloft in sand or dust storms. Wind-blown sand grains striking any solid object in their path can abrade the surface. Rocks are smoothed down, and the wind sorts sand into uniform deposits. The grains end up as level sheets of sand or are piled high in billowing sand dunes. Other deserts are flat, stony plains where all the fine material has been blown away and the surface consists of a mosaic of smooth stones. These areas are known as desert pavements and little further erosion takes place. Other desert features include rock outcrops, exposed bedrock and clays once deposited by flowing water. Temporary lakes may form and salt pans may be left when waters evaporate. There may be underground sources of water in the form of springs and seepages from aquifers. Where these are found, oases can occur.


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