volcanologists, scientists who study volcanoes, pyroclastic flow, avalanche-like emission of red-hot dust and gases, lava, magna that breaks the earth's surface, ring of fire, area around the Pacific Ocean where volcanoes occur most, tephra, mixture of cinders, ash, and rock discharged by a volcano, hot spring, water heated by hot magma, vog, volcanic fog, debris flow, mud and rock fragments that surge down a mountain when part of it collapses, extinct volcano, a volcano that has not erupted in the past and is not expected to erupt in the future, active volcano, a volcano that is expected to erupt, dormant volcano, a volcano that has erupted in the past, is currently inactive, and is not expected to erupt again, active shield volcano, this large, gradually sloping volcano has mild eruptions and a continuous flow of lava. Scientists will study the composition of the gathered lava., dormant composite cone volcano, this large volcano seems to be layered, signifying that different types of lava flows have occurred in the past, but the volcano is presently inactive.

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