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 ...

Mount Etna's strange lava has long perplexed scientists, but new research reveals that the volcano formed in a bizarre way — ...

POPOCATÉPETL VOLCANO, Mexico (AP) — In the predawn darkness, a team of scientists climbs the slope of Mexico’s Popocatépetl volcano, one of the world’s most active and whose eruption could affect ...

Add to the long list of global warming concerns that melting ice caps could trigger more volcanic eruptions. Worse, researchers said Monday at a scientific conference in Prague, the increasing ...

Learn how scientists discovered that Methana, a volcano in Greece believed to be dormant, was actually collecting magma for ...

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 ...