The state with the longest coastline in the Continental U.S. is Michigan.
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The average ice berg weighs 20,000,000 tons!
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Australia's Great Barrier Reef is 1,250 miles long!
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There's a lake under Antarctica that is 25 million years old called Lake Vostok.
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A waterfall known as The Devil's Kettle empties water into a hole and nobody knows where it ends up!
18
The city of Houston, Texas is built on a swamp and is slowly sinking!
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