随着北美、欧洲和亚洲植被的急剧变化，沙漠遍布世界各地。
Deserts spread throughout the world as vegetation shifted drastically in North America, Europe and Asia.
现在，我们来到了北美最炎热、最干燥、最低洼的地方，这就是莫哈韦沙漠的死亡谷，它主要位于美国西部的加州，并一直延伸至内华达州。
Death Valley is part of the Mojave Desert. It lies mostly in the western state of California although part of it reaches into Nevada.
近年来在南极及澳大利亚、非洲和北美的沙漠地区发现和回收了大量的陨石，改变了以前的球粒陨石分类。
The large number of meteorites from Antarctica and the desert areas of Australia, Africa and North America changed the previous chondrite classification in recent years.
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