asthenosphere

As the plates spread apart, the lithosphere, or crust, is moved aside like a lid, allowing molten rock from the liquid asthenosphere to seep through.

板块分离时，岩石圈或地壳象盖子般移到一旁，液态软流层中的熔岩渗溢而出。

Seamounts form from magmatic eruptions, which occur when lava seeps up to the crust through the partially-melted sub-layer, known as the asthenosphere, in the mantle.

火山岩透过地幔中部份熔融的软流层渗入到地壳，岩浆喷发，海山由此形成。