Diagram Of A Canyon
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The Grand Canyon - Martian Chronicles - AGU Blogosphere
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Geology lesson
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Generalized north-south cross section through the upper granite gorge
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How did the Grand Canyon form? | How It Works Magazine
Intro page
Generalized north-south cross section through the Upper Granite Gorge
Nature up close: A Grand Canyon geology lesson - CBS News
Geology - Grand Canyon National Park (U.S. National Park Service)
Lab--Geologic Time
The Grand Canyon - Martian Chronicles - AGU Blogosphere