magma chamber

A magma chamber is a large underground pool of melted rock, or magma, located beneath a volcano. It forms when magma from the Earth's mantle rises and accumulates in a space within the Earth's crust. The chamber acts as a reservoir, supplying magma to the volcano’s eruption. Its size and pressure can vary, influencing whether and when an eruption might occur. Magma chambers are important for understanding volcanic activity, as they are the source of the volcanic material that eventually reaches the surface during an eruption.