The reason that leads to the force that pushes magma from the magma chamber through the pipe and vent of a volcano is due to expanding gases.
Due to the fact that magma is lighter than the solid rock around it, magma tend to rises and gather a lot of magma into its chambers.
Through this, some of the magma tends to pushes through vents and fissures towards the Earth's surface. When magma is thin and runny, gases often are said to escape easily from it.
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