Question

what is a coal explain

Answer 1

Coal is a combustible black or brownish-black sedimentary rock with a high amount of carbon and hydrocarbons. Coal is classified as a nonrenewable energy source because it takes millions of years to form. Coal contains the energy stored by plants that lived hundreds of millions of years ago in swampy forests.

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Answer 2

Answer:

What is Coal?

• Coal is a fossil fuel and is the altered remains of prehistoric vegetation that originally accumulated in swamps and peat bogs.

How is Coal Formed?

• The formation of coal takes millions of years, which is why it is an exhaustible and non-renewable natural resource.
• It was formed around 300 million years ago when the earth was covered with swampy forests.
• When plants in these forests- mainly trees, mosses, ferns, and reeds died, they fell into the swamps.
• Thus, there was a thick layer of dead vegetation in the swamp formed.
• As years passed, more and more plants died and many such layers were formed, one above each other.
• The topmost layers compressed the layers below. Heat and pressure caused some physical and chemical changes and eventually, some carbon-rich deposits were formed.

How is Coal Obtained?

• It is obtained from the underground seams, which are the layers of ores and are thick enough to be mined with profitable results.
• There are two ways in which mining can be done- underground and open-pit. Determining the type of mining depends on the depth of the deposit.
• Vertical shafts are dug to access the deposits through underground mining, whereas in surface or open-pit mining, soil and rocks that lie on top of the mineral deposits are removed.
• The cost of surface mining is lesser than that of underground mining. This is why the surface mining is more dominant.

Uses of Coal

• It is mainly used to generate heat and electricity.
• It is used in households and in industries to accomplish various tasks.
• It is the cheapest source of power fuel.
• The iron and steel industry depends heavily on fossil fuel for energy.
• It is also used to produce useful products such as coke, tar, and coal gas.
• This fossil fuel was responsible for the  Industrial Revolution of the 19th   century.

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