Mercury is a naturally occurring mineral that can be found throughout the environment. Mercury forms can be found as the elemental metal or in a wide variety of organic and inorganic compounds.
There is a constant biogeochemical cycle of mercury. This cycle includes: release of elemental mercury as a gas from the rocks and waters (degassing); long-range transport of the gases in the atmosphere; wet and dry deposition upon land and surface water; absorption onto sediment particles; bioaccumulation in terrestrial and aquatic food chains.

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