Carbon dioxide (chemical formula CO2) is a colorless gas
with a density about 60% higher than that of dry air.
Carbon dioxide consists
of a carbon atom covalently double bonded to two oxygen atoms.
It occurs
naturally in Earth's atmosphere as a trace gas.
Natural sources include volcanoes, hot springs and geysers, and it is
freed from carbonate rocks by dissolution in water and acids.
Because carbon
dioxide is soluble in water, it occurs naturally in groundwater, rivers and
lakes, ice caps, glaciers and seawater.
It is present in deposits of petroleum
and natural gas. Carbon dioxide is odorless at normally encountered
concentrations.
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