Sulfur in the earth is a solid more than it is a gas; it is a naturally occurring element and like iron, silicon, copper, etc. it is part of the primordial make up of planet earth. At the surface, sulfur can react, as many things do, with oxygen, to form sulfur dioxide (and other compounds) which is a gas, and is part of the atmosphere. That occurs naturally.
Humans enhance the process considerably when sulfur-bearing things like coal, natural gas, and oil are burned, and when sulfide ores (as, for example, of copper and other metals) are smelted.
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