Ancient limestones reveal how volcanic carbon once suffocated the oceans - offering a stark warning as modern oxygen levels continue to drop.

Surfers are used to getting mouthfuls of saltwater.

In the depths of the Mid-Atlantic Ridge, underwater volcanoes spew material into the ocean water. Vents that connect underground rifts to the surface release billowing clouds of black deposits of ...

In the depths of the Mid-Atlantic Ridge, underwater volcanoes spew material into the ocean water. Vents that connect underground rifts to the surface release billowing clouds of black deposits of ...

In the depths of the Mid-Atlantic Ridge, underwater volcanoes spew material into the ocean water. Vents that connect underground rifts to the surface release billowing clouds of black deposits of ...

A multinational team of scientists aboard the Exploration Vessel Nautilus will set sail Monday for a 22-day mission to explore the volcanically active seafloor in the Marianas, where they aim ...