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 massive rafts floating ...

(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 ...

Researchers have come up with a new explanation for the origins of Mount Etna, which remains Europe’s most active volcano ...

Though its last eruption was a century ago, California's Lassen Peak is the centerpiece of a volcanic panorama.

When the plate sinks into the mantle it melts to form magma. The pressure of the magma builds up beneath the Earth's surface. The magma escapes through weaknesses in the rock and rises up through a ...

While expeditions to active volcanoes come with risks, experts say informed preparation can make the difference.