1. CALDERA VOLCANOS MAKENZIE LAND, BRITTANY PATRICK, AINSLEY STEWART, JONATHAN FLOYD

2. GENERAL CHARACTERISTICS -Calderas are formed when a volcano collapses into its magma chamber during an explosive eruption. Eruption empties magma chamber and takes away support for mountain top. -Collapse enlargers crater of volcano and fills it with collapsed materials, which later burry deep beneath the crater. -They may be located over large magma chambers in middle of a land mass. -They usually form in association with extremely explosive and powerful eruptions.

3. FORMATION A caldera is a volcanic feature formed by the collapse of a volcano into itself, making it a large, special form of volcanic crater. A caldera collapse is usually triggered by the emptying of the magma chamber beneath the volcano, as the result of a large volcanic eruption.

4. TYPE OF MAGMA Rhyolitic A usually light-colored, fine-grained extrusive igneous rock that is compositionally similar to granite. It often includes flow lines formed during the extrusion.

5. WHERE THEY ARE FOUND Convergent boundaries

6. LOCATIONS Africa, East Asia, Southeast Asia, Southwest Asia, Russia, USA, South America, Europe, New Zealand, and Australia Alaska, Oregon, Colorado, California, Idaho, New Mexico, Wyoming, and Canada Caldera volcano in Alaska