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Volcano Glossary
Volcano
A mountain that forms in Earth's crust where molten material (magma) reaches the surface.
Lava
Liquid magma that reaches Earth's surface.
Hot Spot
An area where magma from deep within the mantle melts through the crust above it. Ex: Hawaiian Islands
Magma
A molten mixture of rock-forming substances, gases, and water from the mantle.
Island Arc
A string of volcanoes that form as the result of subduction of one oceanic plate beneath a second oceanic plate. Ex: Aleutian Island, Alaska