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Magma is molten rock often located inside a magma chamber beneath the surface of the Earth. Magma is a complex high-temperature silicate solution that is ancestral to all igneous rocks, both intrusive and extrusive. Magma is under high pressure and sometimes emerges through volcanic vents in the form of flowing lavaLava is molten rock that a volcano expels during an eruption. Due to its high temperature, lava can be quite fluid when first exuded from a volcanic vent, but eventually solidifies into rock. However, the lava may flow many miles before solidification. and pyroclasticPyroclastic is a term used in volcanology to describe air fall material ejected during a volcanic eruption. This material, known as pyroclast may include pumice, volcanic bombs, ignimbrite and ash. See also Pyroclastic flow Pyroclastic rock Pyroclastic su ejectaIn volcanology, ejecta consists of particles that came out of a volcanic vent, traveled though the air or under water, and fell back on the ground surface or on the ocean floor. Ejecta can consist of # juvenile particles (fragmented magma and free crystal. These products of a volcanic eruption usually contain dissolved gases which have never before reached the planet's surface. Magma collects in many separate magma chambers within the Earth's crust, and will have slightly different compositions in different places.