The effects of volcanoes on the environment depend on climate patterns, the overall scale of the eruption and how much the gases spread. If the acid droplets are large enough, they prevent heat from escaping Earth's atmosphere. Hazards closer to the volcano include pyroclastic flows, mudslides, gas and steam flows, earthquakes, air explosions and tsunamis. The most common gas released by volcanoes is simple water vapor, or steam. Volcanic gases have claimed directly the lives of >2000 people over the past 600 years (Auker et al. Another problem the environment is the ash that is released when a volcano erupts. It is formed during volcanic explosions, from avalanches of hot rock that flow down the side of volcanoes, or from red-hot liquid lava spray. The volcanic gases that pose the greatest potential hazard to people, animals, agriculture, and property are sulfur dioxide, carbon dioxide, and hydrogen fluoride.Locally, sulfur dioxide gas can lead to acid rain and air pollution downwind from a volcano. Volcanic ash is often hot very close to the volcano but is cool when it falls at greater distances. Chronic exposure to H2S in geothermal areas was associated with increases in nervous system and respiratory diseases. Other common volcanic gases include carbon dioxide and sulfur dioxide, along with various hydrogen compounds. effects depend on the distance of a volcano, the viscosity of the magma and the concentrations of gas. Volcanic gases are probably the least showy part of a volcanic eruption, but they can be one of an eruption's most deadly effects. 2013).Millions more people have been impacted by volcanic gas, with effects ranging from respiratory irritation to neurological impacts, to crop failure and famine. The carbon dioxide released by volcanic activity is a greenhouse gas. No studies on health effects of volcanic releases of halogen gases or metal vapors were located. About: Causes and Effects of volcanic eruption Introduction It is already known that volcanic eruption can cause cooling effects on earth by throwing sulfuric acid droplets and ash particles into the atmosphere that eventually block sunlight. Amounts of these gases vary widely from one volcanic eruption to the next. Greenhouse gases are responsible for extreme weather and temperature increases around the world. Sometimes volcanic gases cause lingering detrimental side effects, such as acid rain. Water vapor, the most common gas released by volcanoes, causes few problems. Gas exhalations from volcanic fields are widespread and historical accounts suggest that already since antiquity the effects were noted by people. At low levels, gases can irritate the eyes, nose, and throat. Sulfur dioxide, carbon dioxide and hydrogen are released in smaller amounts. Volcanic eruption ejects sulfur dioxide gas into the atmosphere. Potential effects of volcanic gases. Although gases usually blow away rapidly, it is possible that people who are close to the volcano or who are in the low-lying areas downwind may be exposed to levels that may affect health. Gases derived from volcanoes have severe detrimental impacts on vegetation; direct exposure to volcanic gases over a long term period is lethal to most plant life (McGee, 1997). Some impacts were on a large scale, affecting several countries (e.g., Laki fissure eruption in Iceland in 1783-4). Volcanic ash is composed of fine particles of fragmented volcanic rock (less than 2 mm diameter). That results in higher temperatures, an element of the greenhouse effect. Impacts were on a large scale, affecting several countries ( e.g., Laki eruption! 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