The scientists found that the composition of the magma is a critical element to make the volcano blast. Each has characteristics of different severity is divided into the case as follows:1.) if the magma consists of iron and magnesium, a lot, it is less viscous and thus flow out slowly.2.) if the magma contains silica it is viscous, so when there is an eruption, it burst out.3) magma gas dash is very. The eruption in a violent explosion
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