WEBVTT

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(MUSIC)
JOAN CARTAN-HANSEN, HOST:

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THE EARTH'S CRUST IS MADE
UP OF A NUMBER OF TECTONIC

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PLATES.

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VOLCANOES ARE TYPICALLY LOCATED
WHERE THOSE PLATES MEET.

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THREE QUARTERS OF ALL ERUPTIONS
HAPPEN UNDERNEATH THE OCEAN

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WHERE THE OCEAN'S PLATES ARE
SPREADING APART.

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THE TALLEST VOLCANO ON EARTH IS
HAWAII'S MAUNA KEA AT OVER FOUR

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THOUSAND METERS.

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IF YOU MEASURED IT FROM ITS BASE
UNDER THE OCEAN TO ITS PEAK, ITS

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HEIGHT IS MORE THAN 10 THOUSAND
METERS.

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THAT'S HIGHER THAN MOUNT
EVEREST!

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BUT THE TALLEST VOLCANO IN THE
SOLAR SYSTEM ISN'T ON EARTH.

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IT'S ON MARS.

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OLYMPUS MONS IS 16 MILES HIGH
AND 374 MILES ACROSS.

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IT'S SO BIG; IT WOULD COMPLETELY
COVER THE STATE OF ARIZONA.

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BACK ON EARTH, IF YOU WANT TO
AVOID VOLCANOES, YOU HAVE TO GO

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TO AUSTRALIA.

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THAT'S BECAUSE THERE ARE NO
ACTIVE VOLCANOES THERE BECAUSE

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AUSTRALIA SITS IN THE MIDDLE OF
A TECTONIC PLATE.

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FOR MORE INFORMATION ABOUT
VOLCANOES, CHECK OUT THE SCIENCE

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TREK WEBSITE.

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YOU'LL FIND IT AT
IDAHOPTV.ORG/SCIENCE TREK