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Composite volcanoes, also known as stratovolcanoes, are large, steep-sided volcanoes formed from alternating layers of lava flows, volcanic ash, and pyroclastic material. They are typically associated with subduction zones at convergent plate boundaries. These volcanoes erupt with high-viscosity andesitic to rhyolitic magma, which can trap gases and lead to explosive eruptions. Their structure results from a combination of effusive and explosive activity over time. Composite volcanoes are among the most dangerous due to their explosive potential and proximity to populated areas.
