write a summary about desert expansion maximum 120 words minimum 95 words. its a exercise5 in past paper 0510
Answers
A desert is a barren area of landscape 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 regionswhere little precipitation occurs and which are sometimes called polar deserts or "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.
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Desertification is a global problem that reduces plant productivity, biodiversity, air and soil quality, and water availability. scientists developed an integrated understanding of consequences of desertification in arid ecosystems, including loss of ecosystem services.
Desertification is the shift from perennial grasslands to shrub lands that occurs globally to impact nearly 40% of the Earth’s land surface and a fifth of the world’s human population. Desertification results from interactions between human activities (such as livestock overgrazing) and prolonged drought. However, these broad-scale drivers are insufficient to explain variability in dynamics at finer scales. Long-term research at the Jordan is providing new insights in understanding spatial and temporal variability in the causes and consequences of desertification.
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