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。

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

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这将解开水星密度为何如此之高，水星的两极是否存在冰以及水星的大气从何而来等疑问。

It will clear up questions about its curiously high density, whether it has ice at its poles and where its atmosphere comes from.

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然而，由于各岛屿国家的陆地面积、1人口密度、气候、地理地形条件等有很大差异，它们的森林覆盖程度也有很大差别。

However, due to a considerable variation in land area, 1 population density and climatic, geological and topographical conditions, the extent of forest cover differs greatly among the island states.

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