(CNN) — Here's some background information about volcanoes, mountains that open downward to a reservoir of molten rock. Facts: More than 80% of the Earth's surface, both above and below sea level, is ...

May 6 (Reuters) - A volcano dormant for thousands of years is erupting in the remote South American region of Patagonia, coating nearby towns in ash and forcing emergency evacuations -- the latest in ...

Tonga eruption that poured 150 metric megatons of water vapor into the stratosphere affected the atmosphere for years A new study builds on previous research into the underwater volcano's effects on ...

Italy's Mount Etna lays claim to several titles. It is: The world's most active "stratovolcano" Europe's largest and most active volcano One of the best-monitored volcanoes in the world One of the ...

A powerful swarm of earthquakes in January suggested one of Iceland’s giant “ice volcanoes” may be awakening after a decade of slumber. In the months that followed, more earthquakes have rocked the ...

Add Yahoo as a preferred source to see more of our stories on Google. Picture it. After a grueling 45-minute to one-hour hike up Nicaragua’s youngest volcano, Cerro Negro, you get to reward yourself ...

Scientists find giant magma reservoirs hidden beneath dormant volcanoes in the Cascades The magma system beneath volcanoes may persist even after recent eruptions, a new study finds. Italy's 'ticking ...

Lava is molten rock from a volcano that reaches the Earth’s surface. Liquid rock below the Earth’s surface is referred to as magma. More than 50% of the world’s active volcanoes above sea level ...