05.07.2009
The exposed area from which coal is extracted
The quantity of coal burned for the generation of electric power (in short tons), including fuel used for maintenance of standby service.
A lump of petrified plant matter, frequently spheroid, found in coal seams of the Upper Carboniferous Period (from 325,000,000 to 280,000,000 years ago). Coal balls are important sources of fossil information relating to the forests preceding the Coal Age
Coal ash is the mineral residue that is obtained as a byproduct of the combustion of coal for the production of electricity. Two types of coal ash are obtained: fly ash and bottom ash. The ash is characterized by physical (lightweight, small spherical particles, hardness) and chemical (cement-like) properties that provide it with an economic value as a raw material in many applications
A brown or black sedimentary rock that forms from accumulated plant debris. A combustible rock that contains at least 50% (by weight) carbon compounds
An enhanced oil recovery technique where carbon dioxide (CO2) is injected into the oil formation. CO2 acts as a solvent that releases the oil from porous rock and causes it to flow more freely to the well head, increasing recovery rates