1)
Supervolcanos are volcanoes that erupt with intense explosivity. These volcanoes occur when upwelling magma accumulates below the surface (into a magma chmaber) building up enormous pressure that later causes the crust above to give in. The sudden release of pressure blows the crust above and the magma very high up in the atmosphere. These volcanoes are categorized to have a Volcanic Explosivity Index of 8.
2)
These supervolcanos are mainly made from magma with high silica content (Felsic). This makes the magma highly viscous and one that cools fast. As the magma rises, it is unable to break through to the surface through fissures of the crust above. This is because even if it does so, the magma in the fissures cools fast and plugs them. The magma, also, does not allow its gases to easily escape from in within the magma. Therefore pressure from pent up gases, such as sulfur dioxide, also adds to the build-up of pressure.
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