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Sigma KEE - BrownCoal
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brown coal
BrownCoal
is a soft
Coal
harder than peat and softer than bituminous coal. Also called lignite, it is brownish in color.
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Parents
coal
Coal
is a black or brownish black solid combustible substance formed by the partial decomposition of vegetable matter without free access of air and under the influence of moisture and often increased pressure and temperature.
Coal
is a sedimentary rock containing a high proportion of carbon.
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Sigma version 3.0 is
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