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This rock is what remains from one of the biggest volcanic eruptions ever.

This place is a paradise for geologists and one of our national treasures. It is, of cour

340 million years ago, a warm shallow sea covered all of the American Southwest.

This is not the easiest thing to do—especially in a 100 degree heat—but it’s worth it.

“This rock is more than 4000 feet below the rim of the canyon."

Where you find agates, volcanoes—the source of the gas bubbles—are usually not far way.

So how did North America and its fellow continents get started?

A map of the Midwest of the United States shows the distribution of basalt flows.

These falls are the record of a series of volcanic eruptions that happened in this area.

All over the city you can see outcrops of bedrock. It’s called Manhattan schist.

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