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Extras

    Video thumbnail: NOVA Volcanic Rock Helps Predict Speed of Future Lava Flow

    NOVA

    Volcanic Rock Helps Predict Speed of Future Lava Flow

    If a volcano’s lava is low in silica, the lava will move more quickly during an eruption.

    Volcanic Rock Helps Predict Speed of Future Lava Flow

    Video thumbnail: NOVA Volcano on Fire Preview

    NOVA

    Volcano on Fire Preview

    Climb into the crater of Nyiragongo, a seething and active African volcano.

    Volcano on Fire Preview

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