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 ...

New research suggests Mount Etna forms from deep mantle magma pockets, possibly classifying it as a rare “petit-spot” volcano ...

Learn how Mount Etna stands apart from most volcanoes, having been formed by pockets of magma held in Earth's upper mantle.

The world’s most active volcanoes lie along what’s called the Ring of Fire. It’s also where most earthquakes happen as tectonic plates push against each other, causing tremors. The “ring” stretches ...

Covers how volcanoes are formed, and treats them in historical and mythological perspective, with attention to Mt. St. Helens, Mt. Rainier, and volcanoes in Hawaii. Has a segment on the Modoc people ...