The Sahara Desert
A desert is a region that receives very little rain. When temperatures are high, the rate of evaporation exceeds precipitation. The soil is dry. These regions are called hot deserts. But there are also "cold desert." Although this is a little evaporation in places, the temperatures are so low that little rain is falling as snow. Plants can not survive in such conditions. The vegetation is sparse therefore both types of deserts and the land can not put too much. Desert is a desert species. Deserts cover about one fifth of the world's total land surface. Some deserts are like great seas of sand, while some are rocky or stony deserts.The Thar desert in India, a hot desert due to lack of rain. It is a hot desert in the world. You will find that everything is hot desert about 15 to 30 degrees Cilician Cilician degrees north and south of Ecuador. These deserts are crossed, either by the people of Cancer Tropic of Capricorn.Another function of the hot deserts are found on the western side of continents. Why is this? The reason is that the trade winds blow in this region of the country and carry very little moisture. The winds blow from the northeast which means that the continent's eastern rain. By the time the winds reach the west is very dry. cold currents also flow to Ecuador in the western sides of continents. Winds blowing over these currents get cools and loses moisture. So little rain reaches the earth land.Thus becomes a dry desert. Ecuador South of winds blowing from the hot desert southeast.The largest in the world is the Sahara (the Arabic word for desert), which is south of the Mediterranean Sea and extends across North Africa. Small hot deserts in California are in North America, in Arabia and Central Asia. In the southern hemisphere is the Atacama Desert in southern Africa and the great desert of Australia in the Year of Australia.The in a desert is dry. During the day is hot, sunny and cloudless. The temperature rises above 30 degrees sackcloth. The nights are starry, cloudless and cold. The temperature drops to about 10 degrees sackcloth. There is little or rain, which usually amounts to less than 25 cm per year. Warm days and cool nights to break the rock of the desert as they expand and contract. Thus, most of the deserts are sandy and the strong winds that blow across the desert carrying grains of sand from one place to another to form sand dunes. Sand dunes grow and often leads to world leadership of the wind. Sometimes, entire villages have been covered by dunes.Just as adrift as the northern part of the Thar desert has become fertile under irrigation, so that crops can be grown in the deserts, where irrigation is possible . Most of the Sahara is a plateau some 180 meters high. There are mountains in the desert, but about two-thirds of the surface consists of sand dunes. Much of this land does not receive rain for several years. Suddenly the rain comes in one or two brief showers. This can cause flash foods, full of desert sand and broken rock. This can reduce the deep gorges in the desert, called wadis in Northern Africa and canyons in North America. After the storm like most of the water running in streams called wadis dried. The sand particles carried by the wind carving oddly shaped rocks.
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