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Forty percent of Americans live in coastal counties

Almost 40 percent of the U.S. population lives in coastal counties, which make up less than 10 percent of the land in the contiguous United States.

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The share dates from 2014. NOAA counts 127 million people living in coastal counties.

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Death Valley holds the world heat record

The world record highest air temperature, 134 degrees Fahrenheit, was recorded at Furnace Creek in Death Valley on July 10, 1913.

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North America's tallest mountain is 20,310 feet

Mount McKinley, in Alaska's Denali National Park, rises 20,310 feet and is the tallest mountain in North America.

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The Great Barrier Reef is the largest living structure

The Great Barrier Reef stretches 1,429 miles and is the largest living structure on Earth.

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