WEBVTT

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(MUSIC)
JOAN CARTAN-HANSEN, HOST: A

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ROCK IS A MATERIAL MADE UP OF
ONE OR MORE MINERALS.

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AND MINERALS ARE MADE UP OF
COMBINATIONS OF 92 ELEMENTS,

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SOME ARE MADE OF JUST ONE
ELEMENT, LIKE GOLD

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OR DIAMONDS.

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THESE MINERALS ARE RARE, SO
THEY ARE MORE VALUABLE.

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OTHER MINERALS ARE FOUND IN
COMBINATIONS OF ELEMENTS.

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THE FELDSPAR GROUP ARE THE
MOST COMMON MINERALS ON THE

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SURFACE OF THE EARTH.

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BUT IF YOU LOOK AT THE ENTIRE
PLANET, THE MOST COMMON

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MINERAL ON EARTH IS
BRIDGMANITE.

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IT MAKES UP ABOUT 38 PERCENT
OF THE EARTH'S VOLUME.

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IT'S MADE OF MAGNESIUM, IRON,
CALCIUM AND SILICA AND IS

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FOUND ONLY IN THE MANTLE, NOT
ON THE EARTH'S SURFACE.

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SO FAR, SCIENTISTS HAVE
IDENTIFIED OVER FIVE THOUSAND

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DIFFERENT MINERALS.

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AND MINERALS AREN'T JUST FOUND
IN ROCKS.

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YOU NEED MINERALS IN YOUR BODY
TO STAY HEALTHY.

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YOUR BLOOD IS RED BECAUSE OF
THE IRON OXIDE IT USES TO

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CARRY OXYGEN
AND YOUR BONES CONTAIN THE

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MINERAL CALCITE.

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FOR MORE INFORMATION ABOUT
GEOLOGY CHECK OUT THE SCIENCE

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TREK WEBSITE.

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YOU'LL FIND IT AT SCIENCE TREK
DOT ORG