The state with the longest coastline in the Continental U.S. is Michigan.
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More than a dozen men have stood on the surface of the moon, but only three have been to Challenger Deep in the Marianas Trench, the deepest known spot in the ocean.
17
The city of Houston, Texas is built on a swamp and is slowly sinking!
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Even Antarctica has an area code. It's 672.
58
Australia's Great Barrier Reef is 1,250 miles long!
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One cubic mile of seawater contains about 50 pounds of gold.
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