And weathered rock is more easily picked up, moved, and deposited somewhere else.

风化的岩石更容易 拾取、移动和沉积在其他地方。

Though sometimes the weathered rock can move without the help of an erosional agent like water.

尽管有时风化的岩石可以在 没有水等侵蚀剂的帮助下移动。

It only took a modest flow  through the emergency spillway to reveal the true geologic conditions: the hillside was  composed almost entirely of highly erodible soil and weathered rock.

只需通过紧急溢洪道的少量水流即可揭示真实的地质条件：山坡几乎完全由高度侵蚀的土壤和风化的岩石组成。

Although it was  well-understood that some areas of the spillway's foundation were not good  stuff (in other words, weathered rock and soil), the spillway was designed and maintained as if  the entire structure was sitting on hard bedrock.

尽管众所周知， 溢洪道地基的某些区域不是好东西（换句话说，风化的岩石和土壤）， 但溢洪道的设计和维护就像整个结构坐落在坚硬的基岩上一样。