Millions of years ago, the land was covered with swamps filled with plants and organisms dated back to the 'Carboniferous Period' (380 to 286 million years ago)
As they died, they sank to the bottom of swamps and oceans. At the time, the land was covered with trees and swamps, and the water and seas were filled with algae.
In over a million years, they started to form layers of a spongy material called peat.The peat was covered with sand and clay and other materials which made it become a type of rock named sedimentary. More and more rock started to pile on the other rocks. It started to weigh more and more. It began to press down on the peat which squeezed the peat until water came out of it and eventually over millions of years it turned into coal!
After removing the coal from the ground, the miners may send it to a preparation plant near the mining site. The plant cleans and processes coal to remove rocks, dirt, ash, sulfur, and other unwanted materials. This process increases the heating value of the coal. Coal is burned to heat water into steam, to turn a turbine that generates electricity. The steam is then cooled, condensed back into water and returned to the boiler to start the process over
Coal can be transported from mines and processing plants to consumers in several different ways: Conveyors, trams, and trucks move coal around mines, short distances from mines to consumers close to the mines, or to other modes of long-distance transportation. Coal is used for electricity so the electricity can transported along transmission and distribution power lines, through a sophisticated, connected grid, to your home, work, or workplace, for example.
About 92% of coal is used to generate electricity. Benefits of coal is that: it is inexpensive, abundant in supply and can be converted into many forms. Though we utilize coal for many products such as electricity, it is not the most efficient form of energy. Coal pollutes the Earth as when coal is burned, it emits carbon dioxide and sulfur. Sulfur and carbon dioxide make sulfur dioxide which when mixed with moisture, turns into acid rain.