Volcanoes are one of the most impressive geological features around, but the biggest of them all isn't here on Earth, but ...

“Noctis Mons” is the seventh-largest volcano on Mars, the biggest being this one pictured—Olympus Mons (artist's impression). Scientists have discovered a massive, deeply eroded giant shield volcano ...

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 increase, ...

MAUNA KEA, Hawaii (AP) — Mauna Kea is a dormant 14,000-foot shield volcano. In Native Hawaiian lore, it is the first-born son of the sky father and earth mother. MAUNA KEA, Hawaii (AP) — Shane Palacat ...

Kama?ehuakanaloa (formerly L??ihi Seamount), a submarine Hawaiian volcano located about 20 miles off the south coast of the Big Island of Hawai'i, has erupted at least five times in the last 150 years ...

Volcanoes can look like small mountains or hills. A volcano is an opening in the Earth's crust that allows magma, hot ash and gases to escape. Composite volcanoes are the most common type of volcano.