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The main gasses that are released during a volcanic eruption are water vapor, carbon dioxide, nitrogen, sulfur, and lesser amounts of chlorine, hydrogen, and argon. carbon dioâ¦xide, carbon monoxide, sulfur hydrogen.
Carbon dioxide is abundant in volcanic gases, but not enough to significantly contribute to the greenhouse effect. Volcanoes contribute about 110 million tons of carbon dioxide per year while man's activities contribute about 10 billion tons per year.