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| | Saudi Aramco World : Desert Glass: An Enigma (Site not responding. Last check: 2007-10-22) |
 | | In December 1932, an Egyptian Desert Survey expedition led by P. Clayton was sent southwest from Cairo to study the previously unexplored regions of the Egyptian Sand Sea, north of a broad plateau, the Gilf Kebir. |
 | | For nearly 10,000 years, the Sahara, of which the Great Erg or Sand Sea is a part, has been a hot, forbidding land, unattractive in most regions to human habitation. |
 | | But 50,000 years ago, what is today the Sand Sea may have closely resembled the Mediterranean environment of modern Greece and was thus more habitable. |
| www.saudiaramcoworld.com /issue/197905/desert.glass-an.enigma.htm (2121 words) |
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