GEOLOGY

Detailed explanation-1: -If the magma has high gas content and high viscosity, the gas will expand in an explosive fashion and break the liquid into clots that fly through the air and cool along their path through the atmosphere. Alternatively it blast out solid pieces of rock that once formed the volcanic edifice.

Detailed explanation-2: -PAHOEHOE – has a shiny, smooth, glassy surface. It tends to be more fluid (lower viscosity), hence flows more quickly and produces thinner flows (typically 1-3 m).

Detailed explanation-3: -Explosive eruptions occur where cooler, more viscous magmas (such as andesite) reach the surface.