Viscosity affects the shape of the lava flows and the mountain they erupt from the more viscous the magma and fatter the lava flows.
Step-by-step explanation:
Also, the more viscous the magma a volcano erupts. It faster the sphere falls it and lower the viscosity. The three main factors that determine violent and the explosive a volcanic eruption can be are magma composition, magma temperature, the amount of the gas dissolved in the magma.
It depends on the composition and the temperature of the magma. Higher the
content the magma has the higher viscosity than lower
.