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What type of rock is coal?
Coal is a black or brownish-black sedimentary rock that can be burned for fuel and used to generate electricity. It is composed mostly of carbon and hydrocarbon s, which contain energy that can be released through combust ion (burning).
What is the reflectivity of coal?
An important property of coal is its reflectivity (or reflectance )鈥攊.e., its ability to reflect light. Reflectivity is measured by shining a beam of monochromatic light (with a wavelength of 546 nanometres) on a polished surface of the vitrinite macerals in a coal sample and measuring the percentage of the light reflected with a photometer.
What are the main components of coal?
It is composed mostly of carbon and hydrocarbon s, which contain energy that can be released through combust ion (burning). Coal is the largest source of energy for generating electricity in the world, and the most abundant fossil fuel in the United States.
How is coal formed?
The resulting pressure and heat turned the plants into the substance we call coal. Coal is classified into four main types, or ranks: anthracite, bituminous, subbituminous, and lignite. The ranking depends on the types and amounts of carbon the coal contains and on the amount of heat energy the coal can produce.