The second main source of volcanoes are thought to be mantle plumes.

第二种主要的火山成因被认为是地幔热柱。

This favours impact formation, as zircons transported by mantle plumes would have more profound origins.

这有利于撞击的形成，因为地幔热柱搬运的锆石具有更深的起源。

A powerful mantle plume and area that is hotter than the surrounding magma sits beneath it, which melts and thins, the Earth's crust.

强大的地幔柱和那些由于岩浆活动正在不断变热区域就在板块下边，这使得地壳不断融化和变薄。

Scientists think that an enormous upwelling of intense heat, a mantle plume, is rising from the interior of the planet under this part of the Rift Valley.

科学家们认为，一股巨大、酷热的上涌热源——一股地幔熔岩流，正在地球的内部，在裂谷的这块区域升起。

Much less is known about them, but in a way it is as if the Earth's mantle has weather patterns and mantle plumes are a little like hot air rising to form storm clouds.

我们对它们的了解不多，但某程度上说，就好像地幔有天气型态然后这些地幔热柱有点像热空气上升形成暴风云一样。