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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.
Their research shows that volcanic activity provides the intense heat necessary to release the gas from ancient, helium-bearing rocks, according to a statement from the University of Oxford. Within the Tanzanian East African Rift Valley, volcanoes have released helium from ancient deep rocks and have trapped this helium in shallower gas fields. Photos: Recently active volcanoes Photos: Recently active volcanoes