The Geology of the Grand Canyon 网址：

来源: 于 2007-07-13 05:25:37 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

How was it formed?

Where did all the rock come from?

Why does it look like it does?

When did all this happen?

http://www.bobspixels.com/kaibab.org/geology/gc_geol.htm