GEOLOGY

Detailed explanation-1: -Deep within the Earth it is so hot that some rocks slowly melt and become a thick flowing substance called magma. Since it is lighter than the solid rock around it, magma rises and collects in magma chambers . Eventually, some of the magma pushes through vents and fissures to the Earth’s surface.

Detailed explanation-2: -Ascending magma can cause the volcano edifice to swell before and during an eruption, causing the ground to break up into fissures, typically along weaknesses in the rock such as fractures or faults.

Detailed explanation-3: -The magma rises and collects in chambers within the crust. As magma fills the chamber, pressure grows. If the pressure gets high enough, the magma can break through the crust and spew out in a volcanic eruption. Most explosive volcanoes occur above subduction zones.

Detailed explanation-4: -Molten rock, i.e., magma, is less dense and more buoyant than the surrounding rock, as a result magma rises through Earth’s crust.