Passing by a series of subterranean geological features named cave chocolate, cave bacon and cave popcorn, I start to wonder ...

Along with protection from radiation and harsh temperatures, the lava tubes would protect astronauts from micrometeorite impacts. "They date back to the moon's volcanic activity, so if they exist ...

Yellowstone's volcanic activity is waking up after 160,000 years. Learn how scientists are monitoring and preparing for ...

Violent eruptions have started up again in Hawaii, with fountains of lava shooting hundreds of feet into the air and toxic gas belching from the crater.

A tall fountain of lava is spewing from a volcano on Hawaii's Big Island. A webcam on Tuesday shows vigorous streams of red ...