Nearly 300,000 Americans remain on alert as a massive volcano continues to show signs of unrest that began earlier this year.

Beneath the steaming geysers and bubbling mud pots of Yellowstone National Park lies one of the world's most closely watched volcanic systems. Now a team of geoscientists has uncovered new evidence ...

Scientists have found a chain of underwater volcanoes near the Cook Islands, which are situated in the sea between French Polynesia and American Samoa — a beautiful forgotten territory of the United ...