Science, asked by khushikhatri1, 7 months ago

Describe, in brief, the process of 'coal formation



if any Will give the answer so, please don't write a short answer because It is a long question.

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Answers

Answered by Anonymous
4

The environments or conditions under which these coals were formed: anthracite coal, bituminous coal,

lignite?

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.

Coals are classified into three main ranks, or types: lignite, bituminous coal, and anthracite. These classifications are based on the amount of carbon, oxygen, and hydrogen present in the coal. Coal is defined as a readily combustible rock containing more than 50% by weight of carbon. Coals other constituents include hydrogen, oxygen, nitrogen, ash, and sulfur. Some of the undesirable chemical constituents include chorine and sodium. In the process of transformation (coalification), peat is altered to lignite, lignite is altered to sub-bituminous, sub-bituminous coal is altered to bituminous coal, and bituminous coal is altered to anthracite.

Lignite - is the lowest rank of coal - which means that it has the lowest heating value and lowest carbon content. Although lignite is more solid than peat it crumbles when shipped long distances. Most lignite in the U.S. is in North and South Dakota, Montana, and Texas. Lignite is used to generate electricity. Other uses include generating synthetic natural gas and producing fertilizer products.

Bituminous - is intermediate in rank and sometimes called soft coal. It appears smooth when you first see it, but look closer and you'll find it has many layers. It is the most abundant kind of coal. It has a high heating value, but it also has a high sulfur content. More than 80% of the bituminous coal produce in the U.S. is burned to generate electricity. Other major coal users are the cement, food, paper, automobile, textile and plastic industries. Another important industrial use is to provide coke for iron and steel industries. Bituminous coal derivatives, or by-products can be changed into many different chemicals form which we can make paint, nylon, aspirin and many other items.

Anthracite - is the highest rank of coal which means that it has the highest heating value and highest carbon content. It is very hard, deep black, and looks almost metallic because it is brilliantly glossy. Anthracite burns longer, with more heat and with less dust and soot than other types of coal. The primary market for anthracite is for heating homes. Nearly all of the anthracite in the U.S. is in Pennsylvania, but there are some small beds in other states.

For more info on coal for your research check out the Kentucky Coal Facts Book, it has lots of information about coal from how it was formed to how it's used to make electricity. Another good sight is the Kentucky Geological Survey.

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Answered by singhpinki195
2

How is Coal Formed?

Coal is fossil fuel or fuel that comes from the remains of prehistoric plants or animals.

The formation of coal occurs over millions of years via a process known as carbonation. In this process, dead vegetation is converted into carbon-rich coal under very high temperature and pressure.

Minerals and energy play a very important role in the modern world. Rapid evolution in industrialization and growth in human population has increased the usage of minerals and different forms of energy to a very high level. But one has to understand that the natural resources are not unlimited. Fossil fuels such as natural gas, petroleum, and coal are used to meet most of our energy needs.

Formation of Coal (Process)

Coal is composed of carbon, hydrogen, oxygen, nitrogen, sulphur, moisture, and incombustible mineral matter (i.e., ash). When coal is burned, the carbon. Fluorinated gases are not formed by coal combustion. Coals are formed from the accumulation of vegetable debris in specialized environments.

Obtaining coal from the mines is a difficult job. First, the dirt above the coal deposit is removed. When the coal is exposed, explosives are used to break it into smaller pieces. The coal thus collected is loaded into wagons and lifted to the surface. The mines enter and leave the mine by an elevator through a vertical space called the shaft. Coal mines can easily catch fire and it is very difficult to bring the fire under control.

Coal takes millions of years to form. Millions of years ago, there were places on earth with dense forests in wetlands due to natural disasters such as floods, tsunami, landslides, etc. Over the years, over these forests more and more soil was compiling. These trees were protected by oxidation from biodegradation, usually via mud or acidic water. This traps the carbon in the sediments that were buried. Carbonization happens, carbonization is a phase in which vegetation becomes carbon. It is a slow process.

Process of Formation of Coal

Coal formed under somewhat more moderate conditions are called bituminous coals. These coals are found in flat or gently sloping seams, indicating that the strong geologic pressures operative in the formation of anthracite were not operative during formation of bituminous coal. Coals formed under the least severe conditions are called sub-bituminous coal. Coals formed under the least severe conditions are called sub-bituminous coals.

First Stage – Peat

This is the first stage in the formation of coal. It is an organic substance which is formed due to the partial decomposition of dead matter. The partial decomposition is due to the accumulation of the matter underwater which cuts off the oxygen supply.

Second Stage – Lignite

This is the second stage in the coal formation. It is a dark brown matter formed due to the pressure exerted by the sediments overlying the organic matter. It consists of traces of plants

Third Stage – Bituminous Coal

This is the third stage in the formation of coal. It is formed due to the added pressure. This is also called as soft coal.

Fourth Stage – Anthracite Coal

This is the fourth stage in the coal formation. It is formed due to the high pressure and high temperature for a long period of time. It is hard, lustrous and has the highest percentage of carbon among peat, lignite, bituminous and anthracite. This is also called as hard coal.

Petroleum and natural gas deposits are usually found in the coastal regions.

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