ugol

Ugol is a Russian word that translates to "coal." It refers to a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is composed primarily of carbon, along with variable quantities of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen. Ugol has been an important source of energy for centuries, used for heating, electricity generation, and industrial processes. Russia is one of the world's largest producers and exporters of coal. Different types of ugol exist, including lignite, sub-bituminous coal, bituminous coal, and anthracite, each with varying properties and uses. The extraction of ugol, or coal mining, can be done through surface mining or underground mining methods. Environmental concerns associated with the use of ugol include air pollution from combustion and greenhouse gas emissions.