Question

How does the buoyancy of magma cause volcanic eruptions

Answer 1

Buoyancy of magma: Magma only migrates toward the surface because it is less dense (lighter) than surrounding rock. Indeed, it is the weight of surrounding rock that forces it from its conduits under pressure during eruptions. Reduce the force of gravity and you reduce the buoyant force propelling magma upward.

Answer 2

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.

Step-by-step explanation: