Where Volcanoes Are Born Most volcanoes form at the boundaries of Earth's tectonic plates, which are huge slabs of crust and upper mantle that fit together like puzzle pieces. Think of these plates as ...

The Hayli Gubbi shield volcano, thought to be dormant since almost the last ice age, has erupted, and the volcanic plume is reaching heights at which intercontinental aircraft fly. Hayli Gubbi is ...

A dormant volcano in Ethiopia erupted after 10,000 years of silence. This event shows how the world's little-known volcanoes pose the greatest threat.