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volcano, Vent in the crust of the Earth from which molten rock, hot rock fragments, ash, gas, and steam issue. Most volcanoes are found on the boundaries of the enormous plates that make up the Earth’s surface.
About Volcanoes. By Volcano Hazards Program. Volcanoes are openings, or vents where lava, tephra (small rocks), and steam erupt onto the Earth's surface. Volcanic eruptions can last days, months, or even years.
19 de out. de 2023 · noun. middle layer of the Earth, made of mostly solid rock. plate tectonics. noun. movement and interaction of the Earth's plates. volcanism. noun. upward movement of molten material from within the Earth to the surface, where it cools and hardens.
