Every human step into the canyon represents about 20,000 years' worth of erosion. This short film could be used to stimulate discussion with students about just how slow the process of erosion can ...

Images include deposition of layers and erosion into a canyon, erosion of layers into ... Students may decide to research and report on land formations from their region of the country.

Long ago, the Grand Canyon wasn’t a land of plunging ravines and gaping ... until 1.25 billion years when they were flattened by erosion. A trace of the mountains still exists in the Vishnu ...

Esperero Canyon Middle School’s Eighth-Grade National Junior Honor Society students took hands-on learning to the next level ...