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Volcanic Eruption: A sudden, forceful release of gas and molten rock from a volcano's opening or crater. This process can result in the formation of new landforms, such as volcanic islands and mountains, and can have significant impacts on local ecosystems and global climate patterns. In the hierarchy of Science/Earth Science/Volcanology/Volcanoes, this term specifically refers to the explosive or effusive release of materials from a volcanic vent, which is driven by the pressure of gases and magma within the volcano's internal plumbing system. The study of volcanic eruptions falls under the broader field of Volcanology, which in turn is a subfield of Earth Science, a branch of the overarching discipline of Science. This term encompasses various types of eruptions such as Hawaiian, Strombolian, Vulcanian, Pelean, Plinian and Subplinian eruptions. The description provides insight into the specific phenomenon that occurs within a volcano when it becomes active and the materials stored in its reservoir are expelled.