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Comprehensive Environmental Response, Compensation and Liability Act
U.S. federal law enacted by Congress in 1980 for the purpose of cleaning up existing toxic sites. A.K.A. Superfund, CERCLA.
Compression
The decrease in volume of a rock, rock unit or fossil caused by forces oriented in opposite directions.
Concentration
Amount of a chemical in a particular volume or weight of air, water, soil, or other medium. See parts per billion, parts per million. See parts per billion, parts per million.
Concentration time
See Time of concentration.
Concordant flows
Flows at different points in a river system that have the same recurrence interval, or the same frequency of occurrence. It is most often applied to floodflows.
Condensation
The process by which water changes from the vapor state into the liquid or solid state. It is the reverse of evaporation.
Cone of Depression
A three-dimensional representation of the drawdown created around a pumping well. Taking the shape of an inverted cone, the drawdown is greatest at the pumping well and decreases logarithmically with distance from the pumping well to zero at the Radius of Influence.
Conference of the Parties (COP)
The supreme body of the United Nations Framework Convention on Climate Change (UNFCCC). It comprises more than 170 nations that have ratified the Convention. Its first session was held in Berlin, Germany, in 1995 and it is expected to continue meeting on a yearly basis. The COP's role is to promote and review the implementation of the Convention. It will periodically review existing commitments in light of the Convention's objective, new scientific findings, and the effectiveness of national climate change programs. See United Nations Framework Convention on Climate Change, Berlin Mandate.
Conglomerate
A coarse grained sedimentary rock, with clasts larger than 2 mm.
Conifer
See coniferous trees.

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