B. Sulfur dioxide. Water vapor is typically the most abundant volcanic gas, followed by carbon dioxide and sulfur dioxide. While water vapor is typically the most abundant gas emitted, scientists keep a close eye on the amount of sulfur dioxide (SO 2) emitted because of its association with the magma. This holds a planet's atmosphere close to its surface? D. Moisture. The most abundant gas released from volcanic eruptions is water vapor. The most abundant gases expelled during a volcanic eruption are water vapor (H 2 O in the form of steam) and carbon dioxide (CO 2). Secondary gases are also commonly emitted from volcanoes and include hydrogen sulfide (H 2 S), hydrogen (H), carbon monoxide (CO), hydrogen chloride (HCl), hydrogen fluoride (HF), and helium (He). The most abundant gas is water vapor (H 2 O), followed by carbon dioxide (CO 2), and sulfur dioxide (SO 2). Other emitted gases include carbon dioxide (CO 2), sulfur dioxide (SO 2), hydrogen sulfide (H 2 S), carbon monoxide (CO), hydrogen chloride (HCl), and hydrogen fluoride (HF). Volcanic gases are gases given off by active (or, at times, by dormant) volcanoes.These include gases trapped in cavities in volcanic rocks, dissolved or dissociated gases in magma and lava, or gases emanating from lava, from volcanic craters or vents.Volcanic gases can also be emitted through ground water heated by volcanic action.. By far the most abundant volcanic gas is water vapor, which is harmless. However, significant amounts of carbon dioxide (CO 2 ), sulfur dioxide (SO 2 ), hydrogen sulfide (H 2 S) and lesser amounts of hydrogen halides (hydrogen chloride [HCl] and hydrogen fluoride [HF]) and carbon monoxide (CO) can also be emitted from volcanoes. In fact, even if we include the rare, very large volcanic eruptions, like 1980's Mount St. Helens or 1991's Mount Pinatubo eruption, they only emitted … Active volcanoes can emit different types of gases such as such as water vapor (H 2 O), sulfur dioxide (SO 2), carbon dioxide (CO 2), hydrogen sulfide (H 2 S), and others. The sources of volcanic gases on Earth include: Gravity. The amount of force exerted over … The most abundant gas emitted from volcanoes? Other principal volcanic gases include hydrogen sulfide, hydrogen chloride, and hydrogen fluoride. 52. Sulfur dioxide (SO 2 ) is typically the third most abundant gas. C. Helium. A. Carbon dioxide typically accounts for 10 to 40% of emissions. The abundance of gases varies considerably from volcano to volcano. A. Nitrogen. C. Cloud cover. What two gases are the most abundant gases emitted during basaltic volcanism? Radiation. Read about the characteristics and implications of some of the major greenhouse gases below. Water and carbon dioxide Which one of the following statements concerning volcanic blocks and bombs is true? 51. The concentrations of different volcanic gases can vary considerably from one volcano to the next. Another common gas emitted during a volcanic eruption is sulfur dioxide, and emissions of this gas may have the most significant impact on the Earth's climate. B. The most abundant gas typically released into the atmosphere from volcanic systems is water vapor (H 2 O), followed by carbon dioxide (CO 2) and sulfur dioxide (SO 2).Volcanoes also release smaller amounts of others gases, including hydrogen sulfide (H 2 S), hydrogen (H 2), carbon monoxide (CO), hydrogen chloride (HCL), hydrogen fluoride (HF), and helium (He). Water vapor is consistently the most common volcanic gas, normally comprising more than 60% of total emissions. D. Water vapor. 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