Volcanic systems are geological structures formed by the movement of molten rock, or magma, from beneath the Earth's surface. These systems include various components such as volcanoes, magma chambers, and vent systems, which work together to release gases, ash, and lava during eruptions. The activity of a volcanic system can vary widely, from gentle lava flows to explosive eruptions. Factors like the composition of the magma and the pressure within the magma chamber influence how a volcano behaves. Understanding these systems helps scientists predict eruptions and assess potential hazards to nearby communities.