大部分结晶岩石都非常坚硬，但也有例外，最常见的就是玄武岩，它是一种火山岩浆凝固后的形态，内部充满了微小的气泡，因此也具有多孔渗水的特点。
Most crystalline rocks are much more solid; a common exception is basalt, a form of solidified volcanic lava, which is sometimes full of tiny bubbles that make it very porous.
在水下，火山依旧持续喷发，向上喷射岩浆并形成了一座座玄武岩山峰。
Under the water, volcanoes continued to erupt, sending up magma and forming mountains of basalt.
就灶神星而言，望远镜曾发现过它表面喷发过玄武岩岩浆的证据。
In the case of Vesta, telescopes have spied evidence for the eruption of lava (basalt) on its surface.
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