Silicates such as mineral quartz drifted downward and mixed with denser materials as they reached Earth's core.

石英等硅酸盐向下漂移，在到达地核时与密度更大的物质混合。

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Because of its proximity to Earth's core, the rock at the base of the mantle is much hotter than rock in the upper mantle.

由于靠近地核，地幔底部的岩石比上地幔岩石的温度高得多。

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All are slowly moving because the plates float on a denser sem-iliquid mantle, the layer between the crust and Earth's core.

所有板块都在缓慢移动，因为它们漂浮在密度更大的半流体地幔上，也就是地壳和地核之间的那一层。

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The Earth's core is important because it generates the planet's electromagnetic field - which seems to be weakening.

BBC: Planet Earth

Specifically, what the scientists have found is that the iron adopts a crystalline structure, like a diamond, in the Earth's core.

BBC: Planet Earth

So clear are the steaming pools that to stare down into them is like staring down into a cave that leads to the earth's core.

FORBES: Magazine Article