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Why Do Volcanoes Erupt?

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.

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Why Do Volcanoes Erupt?

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  1. Why Do Volcanoes Erupt?

  2. Magma less dense than rock • Rises towards earth surface • Less rock overhead pressing down on magma

  3. 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

  4. Eruption Song by Mr Parr

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