Why Volcanoes Erupt
    Earth & Space

    Why Volcanoes Erupt

    Magma rises, pressure builds, rock can't hold it — and Earth's pressure-release valve pops.

    Most mountains just sit there. But SOME mountains CATCH FIRE. They throw rock into the sky. They turn the ground into a river of glowing orange. WHY? What's INSIDE there?

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    MagmaPressureTectonicsVolcano Types