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The deserts of Utah and Nevada have not always been dry: Between 14,000 and 20,000 years ago, valleys throughout the desert southwest filled with water to become large lakes, which–at their maximum–covered about a quarter of both those states. And a dry stream bed has been found on Mars–was this "red desert" planet ALSO once covered with water? This transformation may have happened on Mars as well!
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How can a part of the world transform from a green area into a desert? It happened to the Sahara and scientists think this was due to a change in the tilt of the earth. Changes in the Earth’s tilt happen from time to time and they change the weather. A change in our orbit could have done the same thing, and scientists say the earth’s orbit continues to change and will continue to do so in the future.
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We’re still trying to solve the mystery of the mysterious nuclear necklace of King Tut. Prehistoric humans roamed the Sahara, which is now the world’s largest desert, for thousands of years before it became a desert. There are isolated ruins in the area that suggest that there may have been settled communities at one time, perhaps even extensive lost civilizations, although nothing on the scale of the Egypt of the Pharaohs.

Between about 14,000 and 13,000 years ago, the area was very dry. But a drastic switch in environmental conditions some 10,500 years ago brought rain and monsoon-like conditions.
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Desertification is devastating farm production and the variety of plant and animal life in many parts of the world, according to Adel El-Beltagy, director-general of the International Center for Agricultural Research in Dry Areas (ICARDA) in Syria.

?We continue to lose good land to desertification through wind and water erosion, salinity, urbanization and unsuitable farming practices,? says Brian Johnson, a British geneticist. He claims intensive farming methods, such as over-grazing, are degrading soils at an alarming rate and cutting their capacity to hold water. ?Soil degradation has a significant effect on productivity,” says Johnson.
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