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Desertification
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- Mon Nov 02 2009
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... Geography Essay (a) Explain what is meant by the term desertification Desertification is the diminution and destruction of the biological potential of the land which can lead to desert like conditions. The first type of desertification is physical and this is caused by less rainfall total amount decreases every year, Global Warming which means higher temperatures, this means rivers and lakes dry up and vegetation dies so therefore less vegetation which leads to desertification The other type of desertification is caused by humans. Humans cause overgrazing by animals, over cultivation and deforestation this also leads to desertification. There are different types of desert conditions the first one is hot arid regions these receive less than 250mm of rain fall per year and semi arid regions receive between 250 and 500mm of rain fall per year. The desert is growing outwards there are quite a few countries under threat from desertification and every year














