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Ocean pressure rises with every 33 feet of depth

For every 33 feet you go down in the ocean, the pressure increases by one atmosphere.

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At sea level, the air presses on your body at 14.7 pounds per square inch. You do not feel it because the fluids in your body push outward with the same force.

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Petrified wood is almost solid quartz

The petrified wood of Petrified Forest National Park is made up of almost solid quartz.

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The sea is salty because rain wears down rocks

Rocks on land are the major source of the salts dissolved in seawater.

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Seawater contains gold

One study found about one gram of gold in every 100 million metric tons of ocean water.

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