Iron is one of the largest elements in the earths crust as well as it is highly active metals.

铁是地壳中含量最多的元素之一，同时它也是氧化还原性很强的活泼金属。

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In north of China, Latosol-like soils which were exposed to the earths surface were developed from red Paleosol and red paleo-weathered crust.

现今出露于中国北方地表的红色土壤是在红色古土壤和红色古风化壳上发育的，而且大多经历了不连续的成土过程。

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If a large asteroid hit, it would be very difficult for it slow down before it hit Earths crust.

如果一个大型的小行星撞击，在它落地之前很难把它的速度降下来。

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