What are Volcanoes? Volcanoes are vents, or openings in Earth’s crust, that release ash, gases and steam, and hot liquid rock called lava. How are Volcanoes formed? Over Land On land, volcanoes form when one tectonic plate moves under another. …
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What are Volcanoes? Volcanoes are vents, or openings in Earth’s crust, that release ash, gases and steam, and hot liquid rock called lava. How are Volcanoes formed? Over Land On land, volcanoes form when one tectonic plate moves under another. …