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Magma develops within the mantle or crust when the temperature-pressure conditions favor the molten state. Magma rises toward the Earth's surface when it is less dense than the surrounding rock and when a structural zone allows movement.
The volcano's magma forms deep in the Earth's mantle, the layer between the planet's crust and its core. The magma, which is fluid molten rock, then flows upwards to a pool about five miles (8 km) below the peak, the study found. The pool appears to be about 5 to 10 miles (8 km to 16 km) thick and the same width, the researchers said. (Reporting by Victoria Cavaliere; Editing by Daniel Wallis and Eric Walsh).