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英语翻译At the beginning,the early earth seemed to have heated u

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英语翻译
At the beginning,the early earth seemed to have heated up,the center became molten,and convection currents developed as the lighter compounds tended to rise towards the surface forming the brittle crust.Together with the top part of the mantle,it formed the hard slabs known as lithosphere.The continents are embedded in these slabs.The lithosphere is divided into oceanic and continental crusts.
英语翻译At the beginning,the early earth seemed to have heated u
在开始的时候,早期的地球似乎已经升温,他的中心成为熔融状态,对流电流较轻的化合物作为呈上升趋势,地壳表面发展形成.与地幔上部一起,就形成了著名的岩石圈板块.非洲大陆的嵌入使这些岩石圈分为海洋和大陆地壳.