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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.
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.
How cities on the U.S. East Coast could be threatened by a colossal tsunami generated by the collapse of an ancient volcano off the coast of Africa; examining the forces that generate catastrophic waves.
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