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Cirrocumulus

Cirrus clouds with vertical development.

Cirrostratus

Cirrus clouds with a flat sheetlike appearance.

Cirrus

High clouds, usually above 18,000 feet, composed of ice crystals.

Civilian Labor Force

All persons over the age of sixteen who are not in the armed forces nor institutionalized and who are either employed or unemployed.

Classical Economists

Economists prevalent before the Great Depression who believed that the basic competitive model provided a good description of the economy and that if short periods of unemployment did occur, market forces would quickly restore the economy to full employment.

Classical Unemployment

Unemployment that results from too-high real wages; it occurs in the supply constrained equilibrium, so that rightwards shifts in aggregate supply reduce the level of unemployment.

Clast

An individual grain or constituent of a rock.

Clear

Sky condition of less than 1/10 cloud coverage.

Climate

The slowly varying aspects of the atmosphere–hydrosphere–land surface system. It is typically characterized in terms of suitable averages of the climate system over periods of a month or more, taking into consideration the variability in time of these averaged quantities. Climatic classifications include the spatial variation of these time-averaged variables. Beginning with the view of local climate as little more than the annual course of long-term averages of surface temperature and precipitation, the concept of climate has broadened and evolved in recent decades in response to the increased understanding of the underlying processes that determine climate and its variability.

Climate change

(Also called climatic change.) Any systematic change in the long-term statistics of climate elements (such as temperature, pressure, or winds) sustained over several decades or longer. Climate change may be due to natural external forcings, such as changes in solar emission or slow changes in the earth's orbital elements; natural internal processes of the climate system; or anthropogenic forcing.

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