It's a metamorphic rock, which means it becomes something new under extreme heat and pressure without melting.

这是一种变质岩，这意味着它在极端高温和高压下会变成新的东西而不会融化。

Ultimately, if we could drill deep enough, we'd actually find metamorphic rocks on every planet, says McSween.

最终，如果我们能钻得足够深，我们就能在每个星球上找到变质岩，麦克斯温说。

But on other worlds, it's more typical to find metamorphic rocks forged in the split-second shock of a meteoroid impact.

但在其他星球上，更常见的是在流星体撞击的瞬间震荡中形成的变质岩石。

Geochemists at Columbia University found a lode of quartzite, a metamorphic rock formed from sandstone, on the Indian Ocean island of Anjouan.

哥伦比亚大学的地球化学家在印度洋昂儒昂岛上发现了一个石英岩矿脉，石英岩是由砂岩形成的变质岩。

The lowest layers of metamorphic and volcanic rocks, he called the Primary layer.

变质岩和火山岩的最低层 ，他称之为初级层。

The new metamorphic rocks are typically harder, more compact, and are more resistant to weathering.

新的变质岩通常更硬、 更致密，并且更耐风化。

Like igneous rocks could skip being sedimentary rocks and go directly to being a metamorphic rock.

就像火成岩可以跳过 沉积岩，直接变成变质岩。

Ehlmann and her team previously identified metamorphic rocks on Mars that she thinks could have formed when hot groundwater circulated through rocks buried underground, a relatively low-temperature, low-pressure process.

埃尔曼和她的团队之前在火星上发现了变质岩，她认为这些变质岩可能是热地下水在埋藏于地下的岩石中循环时形成的，这是一个相对低温、低压的过程。