Under a swath of Kentucky hills and hollows is a limestone labyrinth that became the heartland of a national park. The surface of Mammoth Cave National Park encompasses about 80 square miles.

Water and Ice Yoho National Park protects the upper watershed of the Kicking Horse River, a steep, unruly tributary of 33 miles. Much of the water comes from the Yoho River, ice cold and milky ...

Geologists led by the University of Maryland and the University of Hawaiʻi finally connected the dots between one of the ...

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