Answer:
A theory which holds that most features of the moon's surface were formed by volcanic eruptions, lava flows, and subsidences when lunar rocks were plastic. Also known as igneous theory; plutonic theory.
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. What follows is a brief description of these processes.
