Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Volcanic gases include a variety of substances given off by active (or, at times, by dormant) volcanoes. These include gases trapped in cavities (vesicles) in volcanic rocks, dissolved or dissociated gases in magma and lava, or gases emanating directly from lava or indirectly through ground water heated by volcanic action. The sources of volcanic gases on Earth include: Substances that may become gaseous or give off gases when heated are termed volatile substances.
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