what are coals

Best answer


Coal is acombustible 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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  • What are some facts about coal?

  • Some Facts on Coal. Coal is the most abundant fossil fuel found on the planet. Fossil fuels are energy sources that formed millions of years ago and are considered nonrenewable resources. They also include oil and natural gas. Coal is a fossil fuel that was formed from once-living plants of various types.

  • What type of rock is coal?

  • Coal is a black or brownish-black sedimentary rock that can be burned for fuel and used to generate electricity. It is composed mostly of carbon and hydrocarbon s, which contain energy that can be released through combust ion (burning).

  • What is the origin of coal?

  • The origin of coal can be traced back to 300 million years ago. After plants die, their remains get buried in the soil. After millions of years, their remains get turned to fossil fuel under high temperature and high pressure.

  • What is the main source of energy in coal?

  • It is composed mostly of carbon and hydrocarbons, which contain energy that can be released through combustion (burning). Coal is the largest source of energy for generating electricity in the world, and the most abundant fossil fuel in the United States. Fossil fuels are formed from the remains of ancient organisms.

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