Mauna Loa in Hawaii has long reigned at the world's largest shield volcano, but it might need to acknowledge a new champion in that category.

Mariner 9, the first spacecraft to orbit another planet, arrived at Mars on Nov. 14, 1971, and returned remarkable images of the surface. This shield volcano on the Red Planet's surface reveals a ...

Deep below the Earth's surface, magma is churning and flowing into the Axial Seamount, an underwater shield volcano about 300 miles off the coast of Oregon. As the volcano grows and tremors ...

Clues to Mars’ climate history A 3D image of Mars’ massive volcano, Olympus Mons, which is the largest in the solar system. Credit: NASA.

Hawaii Volcano Terms Explained [Slide Show] From a'a to vog, a guide to the terminology used to describe the ongoing eruption of Kilauea ...