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Earth's longest mountain range is underwater

The mid-ocean ridge is the longest mountain range on Earth at 40,389 miles, and about 90 percent of it is under the ocean.

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It wraps around the globe like the seam of a baseball. The ridge forms where Earth's great tectonic plates push apart.

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North America's lowest point is in Death Valley

Badwater Basin in Death Valley is the lowest point in North America, 282 feet below sea level.

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The Mississippi River flows 2,350 miles

The Mississippi flows 2,350 miles from its source at Lake Itasca and is the second-longest river in North America.

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The biggest eruption of the 1900s was in Alaska

The largest volcanic eruption of the 20th century occurred in 1912 at Novarupta on the Alaska Peninsula.

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