THE two million-square-kilometer Qinghai-Tibet plateau lies at an average of 4,000 meters above sea level. Once it was the bottom of a great sea. The entire area rose out of the water about 3 million...
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THE two million-square-kilometer Qinghai-Tibet plateau lies at an average of 4,000 meters above sea level. Once it was the bottom of a great sea. The entire area rose out of the water about 3 million...