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Time Travel in the Grand Canyon

What does this geological wonder reveal about North America’s deep history?

Publish Date: Topic: Planet EarthPlanet EarthNova
By Arlo Perez

Within the Grand Canyon, each stratum of soil is a chapter, and together they form the story of America’s epic geological history. This history stretches hundreds of millions of years into the past, and by rappelling into the Grand Canyon, geologist Kirk Johnson witnesses a sampling of it.

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