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All of the following statements about focus groups is true except
Pyroclastic Flows
Fast-moving current of hot gas and volcanic materials that move away from a volcano during an explosive eruption.
Ash Column
A large plume of volcanic ash that is ejected into the atmosphere during a volcanic eruption.
Composite Volcanoes
Volcanic structures formed from alternating layers of lava flows, ash, and other volcanic debris.
Island Arc
Curved chains of volcanic islands located at convergent tectonic plate boundaries, often formed from the subduction of an oceanic plate under another oceanic plate.
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