When the Earth was young, it most likely had a ring of rock debris around it.

地球初生时它很可能被一个岩屑环包围着。

One example is the use of mercury, which is mixed with the rock debris to extract gold.

一个例子是使用汞，将其与岩石碎片混合来提取黄金。

Glaciers may form in permanently cold areas, and these slowly moving masses of ice cut out valleys, carrying with them huge quantities of eroded rock debris.

冰川可以永久存在于寒冷地区，而这些缓慢移动的大量冰块却切削着峡谷，它们带走了大量被侵蚀的岩石碎片。