GEOLOGY

Detailed explanation-1: -A volcano’s explosiveness depends on the composition of the magma (molten rock) and how readily gas can escape from it. As magma rises and pressure is released, gas bubbles (mainly of water vapor and carbon dioxide) form and expand rapidly, causing explosions.

Detailed explanation-2: -A magma’s composition, viscosity, and gas content, the eruption rate, and the size of the magma reservoir determines many aspects of eruptions, including how explosive they are.

Detailed explanation-3: -Although there are several factors triggering a volcanic eruption, three predominate: the buoyancy of the magma, the pressure from the exsolved gases in the magma and the injection of a new batch of magma into an already filled magma chamber.

Detailed explanation-4: -The composition of volcanic products. The variety of volcanic eruption types. The geometry of the vent. The environment into which the volcanic products are erupted.