lava

This term specifically describes magma once it has breached the surface of the earth. It carries a connotation of destructive power and intense heat, often evoking images of slow-moving but unstoppable geological force. While magma exists underground, lava is the visible, surface-level manifestation of volcanic activity.

Grammatically, this noun is uncountable. It refers to a mass of molten material rather than individual units, meaning it cannot be pluralized as lavas in standard contexts and requires partitive phrases such as a stream of lava or a flow of lava when referring to specific quantities.