Cause of volcanic eruptions.

The cause of volcanic eruptions is the release of gases from the mantle. Trying to free itself from very strong pressure, magma rushes up the vent and erupts to the surface of the earth.
Rising, magma loses gases and water vapor – turning into lava. The force of the volcano’s explosion can be so destructive that a giant “funnel” (caldera) remains in the place where the mountain was.

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