Scientists seek clues to the formation of North America's Great Lakes, the largest expanse of fresh water on the planet; delving into an underground salt mine; investigating a fossilized coral reef; diving to the bottom of Lake Superior.
The virtually rainless Atacama Desert nestled along Chile's Pacific coast west of the Andes is considered the driest place on Earth; bacteria found in the Atacama gives scientists hope they might find life on Mars.
Geologists evaluate Yellowstone National Park, one of the most-dangerous geological features on Earth; 500 earthquakes hit the park early in 2009, raising concerns that a supervolcano is beginning to stir.
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