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。

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。

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。

All are slowly moving because the plates float on a denser semi-liquid 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液态地幔上，也就是地壳和地核之间的那一层。

Because it usually exists in a metallic state, it was preferentially incorporated in Earth's core as the planet cooled and consolidated.

因为它通常以金属的状态存在，并且在地球的冷却和固结的过程中，会优先合并到地核中。