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Why Do Volcanoes Erupt?

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Why Do Volcanoes Erupt?. Magma less dense than rock Rises towards earth surface Less rock overhead pressing down on magma. Pressure decreases enough, gases dissolved in magma come boiling out like a shaken bottle of pop Gases shoot lava or hardened lava out of the vent. - PowerPoint PPT Presentation

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WHY DO VOLCANOES ERUPT?

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Why Do Volcanoes Erupt?

Why Do Volcanoes Erupt?Present these before types of volcanoes1Magma less dense than rockRises towards earth surfaceLess rock overhead pressing down on magmaPressure decreases enough, gases dissolved in magma come boiling out like a shaken bottle of popGases shoot lava or hardened lava out of the ventEruption Song by Mr Parr

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