A brown to black combustible rock that originated by accumulation and subsequent physical and chemical alteration of plant material over long periods of time, and that on a moisture-free basis contains no more than 50% mineral matter. The plant debris accumulated in various wet environments, commonly called peatswamps, where dead plants were largely protected from decay by a high water table and oxygen-deficient water. The accumulating spongy, water-saturated, plant-derived organic material known as peat is the precursor of coal. Over time, many changes of the original vegetable matter are brought about by bacteria, fungi, and chemical agents. The process progressively transforms peat into lignite or brown coal, subbituminous coal, bituminous-coal, and anthracite. This progression is known as the coalificationseries. The pressure exerted by the weight of the overlying sedimentand the heat that increases with depth, as well as the length of exposure to them, determine the degree of coalification reached. See also fossil-fuel; kerogen; lignite-1; peat.
anthracite coal
is a coal called Anthikal
Lignite is the softest form of coal.
anthracite coal is the metamorphic form of bituminous coal which is the sedimentary form. in other words it has been heated under pressure.
Amongst coal varieties, anthracite is the purest form. It contains about 94 - 95% of carbon.
# WHAT IS THE MOST COMMON FORM OF COAL IN Pennsylvania?
anthracite coal
Coal forms from peat, and peat forms in bogs. There is not enough organic material in the arctic to form coal.
Coal is formed from plants, which turned into peat, then lignite, then coal.
Lignite is the softest form of coal.
is a coal called Anthikal
Coal is a form of carbon.
anthracite coal is the metamorphic form of bituminous coal which is the sedimentary form. in other words it has been heated under pressure.
anthracite coal is the metamorphic form of bituminous coal which is the sedimentary form. in other words it has been heated under pressure.
Coal stores energy from the sun in the form of chemical energy
Amongst coal varieties, anthracite is the purest form. It contains about 94 - 95% of carbon.
Amongst coal varieties, anthracite is the purest form. It contains about 94 - 95% of carbon.