Volcano's discharge is the term used to describe the molten rock and gas that is expelled from a volcano during an eruption. The most common form of this discharge is LAVA, which is a hot, molten rock that flows out of the volcano. LAVA is composed of various minerals and gases, and can reach temperatures of up to 1, 200 degrees Celsius. When it cools, it forms new landforms such as cinder cones and LAVA flows.