The Grand Canyon has long been held up as a textbook example of slow, steady erosion carving a young gorge into ancient rock. New research is now challenging that familiar storyline, suggesting the ...

The water pressure of a river can cut deep into a riverbed. Sediments from the riverbed are carried downstream, creating a deep, narrow channel. This process, known as downcutting, represents the ...

Visitors to the Grand Canyon always want to know: How old is it? Park rangers are instructed to tell them that the canyon has been carved by the Colorado River for the past 5 or 6 million years. The ...