These chambers are connected to shallower underground pools of rhyolitic magma, which is thicker and requires more pressure to erupt, but tends to produce more explosive eruptions. The entire ...

A gas explosion can result when it expands rapidly. Expansion in magmas rich in silica is also caused by the trapping of explosive gases. The magma of a volcano that is rich in silica tends to be ...

The interactions of plates have also guided magma to the surface and spawned volcanoes, both by moving away from each other and pushing against each other. A third process behind volcano creation ...