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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