(MUSIC)

JOAN CARTAN-HANSEN, HOST:

AN ACTIVE VOLCANO IS

CONSIDERED TO BE ONE THAT HAS

ERUPTED IN THE LAST FEW THOUSAND

YEARS.

A DORMANT VOLCANO IS ONE THAT

HAS ERUPTED IN RECENT GEOLOGICAL

TIMES BUT IS NOW QUIET.

AN EXTINCT VOLCANO IS ONE WHERE

IT HAS BEEN SO LONG SINCE AN

ERUPTION THAT SCIENTISTS THINK

IT'S UNLIKELY IT WILL EVER GO

OFF AGAIN.

THERE ARE 169 ACTIVE VOLCANOES

IN THE UNITED STATES AND ITS

TERRITORIES.

MOST ARE IN ALASKA, HAWAII AND

SCATTERED IN THE WESTERN UNITED

STATES.

KILAUEA IS THE MOST ACTIVE

VOLCANO ON EARTH.

IT'S BEEN ERUPTING ALMOST

CONTINUOUSLY SINCE 1983.

THE 1980 MOUNT ST. HELENS

VOLCANIC ERUPTION WAS THE

DEADLIEST IN U-S MODERN HISTORY.

57 PEOPLE AND THOUSANDS OF

ANIMALS DIED.

AND IT CAUSED THE LARGEST

LANDSLIDE IN RECORDED HISTORY.

TODAY, ONE IN 20 PEOPLE LIVE

WITHIN THE DANGER RANGE OF AN

ACTIVE VOLCANO.

DO YOU?

FOR MORE INFORMATION ABOUT

VOLCANOES, CHECK OUT THE SCIENCE

TREK WEBSITE.

YOU'LL FIND IT AT

IDAHOPTV.ORG/SCIENCE TREK