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Volcanoes and Plate Tectonics

Volcanoes and Plate Tectonics. Ring of Fire. What is a volcano?. a weak spot in the crust where molten material, or magma, comes to the surface . What is Magma?. A molten mixture of rock-forming substances, gases, and water from the mantle . When does magma become lava?.

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Define ring - PowerPoint PPT Presentation

Volcanoes and Plate Tectonics