The concentrations of different volcanic gases can vary considerably from one volcano to the next. By far the most abundant volcanic gas is water vapor, which is harmless. C. Cloud cover. Read about the characteristics and implications of some of the major greenhouse gases below. The amount of force exerted over … The abundance of gases varies considerably from volcano to volcano. 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. Water vapor is consistently the most common volcanic gas, normally comprising more than 60% of total emissions. C. Helium. 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. 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). The most abundant gas is water vapor (H 2 O), followed by carbon dioxide (CO 2), and sulfur dioxide (SO 2). 52. A. Water and carbon dioxide Which one of the following statements concerning volcanic blocks and bombs is true? Carbon dioxide typically accounts for 10 to 40% of emissions. 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). A. Nitrogen. B. 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. Gravity. Radiation. 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. What two gases are the most abundant gases emitted during basaltic volcanism? 51. 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). The most abundant gas released from volcanic eruptions is water vapor. The sources of volcanic gases on Earth include: Water vapor is typically the most abundant volcanic gas, followed by carbon dioxide and sulfur dioxide. 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 … This holds a planet's atmosphere close to its surface? D. Moisture. The most abundant gas emitted from volcanoes? B. Sulfur dioxide. 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). Vog (volcanic smog) is a visible haze comprised of gas and an aerosol of tiny particles and acidic droplets created when sulfur dioxide (SO2) and other gases emitted from a volcano chemically interact with sunlight and atmospheric oxygen, moisture, and dust. Other principal volcanic gases include hydrogen sulfide, hydrogen chloride, and hydrogen fluoride. Sulfur dioxide (SO 2 ) is typically the third most abundant gas. 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