The river carried dirt and pieces of stone that slowly ate away at the surrounding rock.

这条河夹杂着泥土和石块，这些石块在慢慢地侵蚀周围的岩石。

One year later, there remains a lot of mystery surrounding the space rock.

一年后，太空岩石周围仍然存在许多谜团。

Sand almost brimmed their basin, leaving only a dim lip of surrounding rock.

沙子几乎淹没了他们的盆地，只留下周围岩石的模糊边缘。

Inside this giant dome, chemicals are used to separate the valuable molybdenite from surrounding rock.

在这个巨大的穹顶内，化学物质用于将有价值的辉钼矿与周围的岩石分离。

The trouble with relying on flowstones is that they can be younger than the surrounding rock.

依赖流石的麻烦在于它们可能比周围的岩石更年轻。

With this scale, called the Conodont Alteration Index, geologists can use the color of a conodont that they find, to figure out how hot the surrounding rock once was.

有了这个称为牙形石改变指数的尺度，地质学家可以使用他们发现的牙形石的颜色来计算周围岩石曾经有多热。