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Some beach sand is parrotfish poop

Parrotfish grind up coral reef material in their guts and excrete it as sand.

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The fish scrape algae off rocks and dead coral with parrot-like beaks, and the inedible calcium carbonate comes out as sand. Parrotfish can produce hundreds of pounds of white sand each year.

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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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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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Some beach sand is parrotfish poop

Why it is true

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More from science facts

Ocean pressure rises with every 33 feet of depth

Petrified wood is almost solid quartz

The sea is salty because rain wears down rocks

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