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The Colorado River runs 277 miles through Grand Canyon

The Colorado River travels 277 miles through Grand Canyon and descends about 2,000 feet along the way.

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That drop adds to the river's power. The river carved its way downward, and erosion by tributary streams widened the canyon.

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Most of the largest earthquakes strike the Pacific rim

About 81 percent of the planet's largest earthquakes occur along the rim of the Pacific Ocean, in the Ring of Fire.

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One park holds more than 2,000 stone arches

Arches National Park has over 2,000 documented arches, the densest concentration of natural stone arches in the world.

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Earth has one global ocean

There is only one global ocean, a single body of water that covers 71 percent of the Earth.

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