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Early Start for Our First Continents

机译:我们第一批大陆的早期开始

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摘要

We're all here thanks to continents. Among rocky planets in the solar sys-tem, only ours has masses of less-dense rock that rise above surrounding crust. Yet our planet wasn't born with them. We know that these land masses are a direct consequence of plate tectonics, when slabs of crust, continental and oceanic, interact as they move across the planet's melted mantle. But we don't know when or how quickly the continents formed — it's one of the most challenging ques-tions about Earth's early history. Some geologists believe most of the continents popped up in the last billion years. Others think they have been forming slowly and steadily since the planet took shape some 4.6 billion years ago. Still other schools of thought suggest the land masses formed in fits and starts as pieces of them collided and then broke apart.
机译:我们都在这里,感谢各大洲。在太阳系中的岩石行星中,只有我们的行星中有密度较低的岩石块,它们上升到周围的地壳上方。然而,我们的星球并非与他们同在。我们知道,这些陆块是板块构造的直接结果,当大陆和海洋的地壳板块在地球融化的地幔中移动时相互作用。但是我们不知道这些大陆的形成时间或发展速度—这是地球早期历史上最具挑战性的问题之一。一些地质学家认为,在过去的十亿年中,大多数大陆都突然出现。其他人则认为,自大约46亿年前行星成形以来,它们一直在缓慢而稳定地形成。还有其他一些学派认为,土地块是相互碰撞形成,然后破裂而形成的。

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  • 来源
    《Discover》 |2020年第1期|82-83|共2页
  • 作者

    ERIK KLEMETTI;

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