BBC Science Focus Magazine

Yellowstone National Park. Natural Wonder. Existential Threat?

In 1872, President Ulysses S Grant and the 42nd US Congress enacted a law making Yellowstone the first national park, not just in America, but the entire world.

At over 8,900km2 (2.2 million acres), the park is huge, stretching across Wyoming, Montana and Idaho. It's home to all sorts of wildlife including bears, wolves and bison.

The park is well known for its geothermal features, including its supervolcano and the world-famous geyser Old Faithful, which has over 1,000,000 recorded eruptions.

What would cause Yellowstone to erupt?

There's a lot we don't know about supervolcano eruptions; there hasn't been one in recorded history. So,

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