Translations:Adventist Youth Honors Answer Book/Nature/Geology/10/en

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Mount St. Helens on May 17, 1980, one day before the devastating eruption. It is a composite volcano.

A composite volcano is a tall, conical volcano composed of many layers of hardened lava, tephra, and volcanic ash. These volcanoes are characterized by a steep profile and periodic, explosive eruptions. The lava that flows from them is viscous, and cools and hardens before spreading very far. Mount St. Helens in Washington, USA, Popocatépetl in Mexico, and Krakatoa in Indonesia are composite volcanos.