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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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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When it said the poles will shift means that earths north and South pole will swap places, also meaning that the earths crust is going to spin.

地球两极的变化意味着地球的南北两极将互换位置，并且地球表壳将会旋转。

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