Chains of volcanoes and oceanic trenches form the so-called Ring of Fire, encircling the Pacific Basin. The trenches are labeled in blue.

Map: Courtesy of the U.S. Geological Survey.

Article: The Earth at Work | Sidebar One: Probing the Depths | Sidebar Two: "Black Smokers" | Sidebar Three: Ring of Fire | ANIMATION
Hell's Crust: Our Everchanging Planet  |  The Restless Planet: Earthquakes
Out of the Inferno: Volcanoes  |  Waves of Destruction: Tsunamis