![]() ![]() Magma with more silica also tends to contain more dissolved gas. This means more pressure can build up before the magma is forced out of the volcano. The higher the silica content, the greater the viscosity of the magma. In particular, magmas with more silica erupt more explosively. Eruptions are classified according how explosive they are, and the height of their eruption column– how high they blast material into the air.īoth the explosiveness of an eruption and the height of the eruption column are related in part to the composition of magma and the amount of gas it contains. ![]() The characteristics of the eruptions themselves also vary from one volcano to the next, and sometimes from one eruption to the next for the same volcano. Volcanoes produce a variety of materials when they erupt. ![]()
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