How does a volcano erupt and why?

The improvement of magnetic waves and electric until the deformation occurs in the body of the mountain.

The tectonic plates jostle each other and magma in the earth’s belly was pressing and pushing the surface of the earth and triggering activity of geological, volcanic, and tectonic.

Due to extremely high pressure, the magma urgent out (eruption) from the earth's surface as lava.

A volcano erupts when the pressure within the molten magma below the surface becomes stronger than the strength of the rocks on the surfacethat make up the volcano. The magma then finds the path of least resistance to the surface and erupts. That pressure comes both from the buoyancy of the magma and from gas bubbles inside the magma that want to expand.

The magma pressure comes from the expansion of gas bubbles that are within the magma.

The heat source for all erupted materials comes from natural radioactive decay within the Earth. The concentration of radioactive elements in the Earth is not really very high, but the volume of the Earth is great enough so that there is enough of a contribution of heat from the decay to produce melting.

The material that melts (magma) has a lower density and it migrates to the surface to erupt.

A volcano is any opening in the Earth's surface which can allow molten rock and volcanic gases to escape from far below the Earth's surface. Although many volcanoes are mountainous in shape, a volcano can exist in nearly any form, including volcanic vents which exist on the ocean floor, ice volcanoes, which have been found on a variety of other planets, and volcanoes that are simply a crater in the ground. As the magma reaches the surface, it is thrust through the vents on the volcano, resulting in an eruption.

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