Question

Describe the formation of coal

Answer 1

Coal formed millions of years ago when the earth was covered with huge swampy forests where plants - giant ferns, reeds and mosses - grew. As the plants grew, some died and fell into the swamp waters. New plants grew up to take their places and when these died still more grew. In time, there was thick layer of dead plants rotting in the swamp. The surface of the earth changed and water and dirt washed in, stopping to decaying process. More plants grew up, but they too died and fell, forming separate layers. After millions of years many layers had formed, one on top of the other. The weight of the top layers and the water and dirt packed down the lower layers of plant matter. Heat and pressure produced chemical and physical changes in the plant layers which forced out oxygen and left rich carbon deposits. In time, material that had been plants became coal. .. hope it helped you

Answer 2

Coal was formed from plants and animal got buried deep under the earth crust over a large period of time the chemical and physical properties of this plants remains were changed throw geographical actions that leads to the certain of these soil material, the process of conversion of the plants material into coal . The formation of coal depend on the quality of the coal , As you know that there are four variety of coal depending upon the occurrence of coal and formation of coal, the types of coal depend on the temperature and pressure condition and the time period of formation there are four different varieties of coal, they are as follows ------»

★ PEAT :------ It is imperia quality of the coal it is soft brown substance having 30% of carbon it is earliest stage during the formation of coal.

★ LIGNITE :----- It contains 38% of carbon it is used for making on other types of fuels as well as used for electricity production, Example as :----- used for electric power generation, (NTPC)......

★ BITUMINOUS :----- It has 68% of carbon it is used for making another types of fuel as well as used for electricity production example as fuel and coke.

★ ANTHRACITE :----- It has a hard coal and it contains 90% of carbon it is quite hard, it is best quality of coal.

The variety of coal depend upon the formation of coal from each other in terms of their -----›

Content a volatile material

Percentage of carbon

Moisture

Other (Impurities) element