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magma  

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  • A magma is molten rock material consisting of a more or less viscous mixture of gas, liquid and crystals, generated beneath the Earth's surface and from which igneous rocks are derived by solidification, called volcanic on the surface and plutonic at depth.
    (Adapted from: Moureau M. & Brace G. (2000). Comprehensive Dictionary of Earth Science - Dictionnaire des Sciences de la Terre. Paris, Technip.)

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