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(MUSIC)

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JOAN CARTAN-HANSEN, HOST:

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AN ACTIVE VOLCANO IS

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CONSIDERED TO BE ONE THAT HAS

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ERUPTED IN THE LAST FEW THOUSAND

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YEARS.

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A DORMANT VOLCANO IS ONE THAT

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HAS ERUPTED IN RECENT GEOLOGICAL

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TIMES BUT IS NOW QUIET.

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AN EXTINCT VOLCANO IS ONE WHERE

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IT HAS BEEN SO LONG SINCE AN

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ERUPTION THAT SCIENTISTS THINK

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IT'S UNLIKELY IT WILL EVER GO

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OFF AGAIN.

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THERE ARE 169 ACTIVE VOLCANOES

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IN THE UNITED STATES AND ITS

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TERRITORIES.

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MOST ARE IN ALASKA, HAWAII AND

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SCATTERED IN THE WESTERN UNITED

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STATES.

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KILAUEA IS THE MOST ACTIVE

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VOLCANO ON EARTH.

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IT'S BEEN ERUPTING ALMOST

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CONTINUOUSLY SINCE 1983.

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THE 1980 MOUNT ST. HELENS

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VOLCANIC ERUPTION WAS THE

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DEADLIEST IN U-S MODERN HISTORY.

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57 PEOPLE AND THOUSANDS OF

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ANIMALS DIED.

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AND IT CAUSED THE LARGEST

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LANDSLIDE IN RECORDED HISTORY.

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TODAY, ONE IN 20 PEOPLE LIVE

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WITHIN THE DANGER RANGE OF AN

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ACTIVE VOLCANO.

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DO YOU?

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FOR MORE INFORMATION ABOUT

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VOLCANOES, CHECK OUT THE SCIENCE

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TREK WEBSITE.

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YOU'LL FIND IT AT

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IDAHOPTV.ORG/SCIENCE TREK