What Happens Inside a Volcano Before It Erupts?

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A volcano can remain seemingly quiet for decades and, at a certain point, begin to expel gases, ashes or lava. Even if the change seems sudden, the history of an eruption begins much earlier and several kilometers deep. There is the magma, a mixture of molten rock, crystals and gases. As it is usually less dense than the solid rocks that surround it, it tends to ascend. During that journey it can accumulate under a volcano and, if it finds fract…