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Semi-Precious Pebbles

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

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

A map of the Midwest of the United States shows the distribution of basalt flows.
Five Steps of Volcanic Rock

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

All over the city you can see outcrops of bedrock. It’s called Manhattan schist.
Rockies 2.0

But why is it that these layers that were once horizontal are now standing on their heads?
Volcanoes of Sand

What we found were strangely regular circles in the sandstone.
Fossilized Sand Dunes

This is Zion Canyon. Its 2000-foot sandstone cliffs are among the tallest of their kind.
New York's Mountains

Today these steel and concrete giants dominate New York’s skyline.
Manhattan Skyline

It's actually the geology that gives this very American city its very particular look.

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