How Old is the Grand Canyon?

SCIENCE

To the untrained eye, the Grand Canyon might just look like one big hole in the ground. But to some scientists, the American Southwest’s iconic gorge is increasingly looking like several ancient canyons of different ages, stitched together by erosion. (National Geographic News)

Use our resources to color-code the Grand Canyon’s ages.

Discussion Ideas

  • Look at our cool coloring page of the Grand Canyon. The Fun Fact says “The oldest rocks in the Grand Canyon are almost two billion years old.” The Nat Geo News article says the oldest parts of the Grand Canyon are only 70 million years old. What’s going on here?
    • The Nat Geo News article is about the age of the canyon itself—the deep, steep valley carved in rock. Our coloring page gives you a fast fact about the age of the rocks that make up the Grand Canyon. The rocks were around for a long, long time before they started eroding!
  • Have people had an impact on the formation of the Grand Canyon? How?
    • Yes, human activity is impacting the Grand Canyon as we speak. The Colorado is one of the most dammed rivers in the world. Dams prevent the natural flow of sediment from the river and disrupt natural erosion patterns.

One response to “How Old is the Grand Canyon?

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