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Questions for Discussion: The Grand Canyon: Ancient Mountains
- Which of the three major rock types is the 1.7-billion-year-old Vishnu Schist, described in the video as once "sandstone and shale, which have been cooked..."?
- The video states there once was a mountain range as high as the Himalayas before the Vishnu Schist was formed. What evidence has led geologists to reach this conclusion?
- What do you predict will happen in the Grand Canyon in the future?
