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。
When a reservoir is sufficiently large, a sphere of this hot rock forces its way up through the upper mantle to Earth's surface, creating a broad bulge in the topography.
当储层足够大时，这种炽热岩石的一个球体强行通过上地幔上升到地球表面，在地形上形成一个宽阔的隆起。
The scientists posit that these meteor strikes may also have triggered the flow of hot rock in the upper layer of the mantle right below the Earth's crust that is seen up to the present day.
科学家们断定，这些流星的冲击也可能触发了刚好低于地球地壳的地幔上层里的热岩，这就是至今我们所能看到的。
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