![]() It is present in deposits of petroleum and natural gas. ![]() Because carbon dioxide is soluble in water, it occurs naturally in groundwater, rivers and lakes, ice caps, glaciers and seawater. Natural sources include volcanoes, forest fires, hot springs, geysers, and it is freed from carbonate rocks by dissolution in water and acids. The current concentration is about 0.04% (412 ppm) by volume, having risen from pre-industrial levels of 280 ppm. It occurs naturally in Earth's atmosphere as a trace gas. Carbon dioxide molecules consist of a carbon atom covalently double bonded to two oxygen atoms. 2) is an acidic colorless gas with a density about 53% higher than that of dry air.
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