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What is the typical source of pressure buildup inside a volcano?

centrifugal force of Earth rotation

magma convection

boiling of rainwater

degassing of magma

The whole process begins when hot magma is lifted by convection to the magma chamber. As the pressure in the chamber is lower than deep in Earth's crust, the gas starts to release. Since degassed magma has lower density, it may then sink and be replaced with new one. This process may build up huge pressure of gases, eventually causing explosion.

Sumit Tamang

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