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A brown to black combustible rock that originated by accumulation and subsequent physical and chemical alteration of plant material over long periods of time, and that on a moisture-free basis contains no more than 50% mineral matter. The plant debris accumulated in various wet environments, commonly called peatswamps, where dead plants were largely protected from decay by a high water table and oxygen-deficient water. The accumulating spongy, water-saturated, plant-derived organic material known as peat is the precursor of coal. Over time, many changes of the original vegetable matter are brought about by bacteria, fungi, and chemical agents. The process progressively transforms peat into lignite or brown coal, subbituminous coal, bituminous-coal, and anthracite. This progression is known as the coalificationseries. The pressure exerted by the weight of the overlying sedimentand the heat that increases with depth, as well as the length of exposure to them, determine the degree of coalification reached. See also fossil-fuel; kerogen; lignite-1; peat.
Coal forms from the remains of ancient plants and trees that have been buried and compressed over millions of years. As the organic material is subjected to heat and pressure underground, it transforms into coal through a process called coalification. The type of coal formed depends on the composition of the plant material and the conditions under which it was buried and compressed.
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Which element forms both coal and diamonds?
Carbon is the element that forms both coal and diamonds. The difference in their structure and properties is due to the conditions under which they are formed - coal forms under low pressure and temperature, while diamonds form under high pressure and temperature.
What element is found in coal or diamonds?
Carbon is the element found in both coal and diamonds.
How does anthracite coal forms?
Anthracite coal forms from the metamorphism of bituminous coal under high pressure and temperature over millions of years. This process drives off volatile components and increases the carbon content, resulting in a coal with a high carbon and energy content.
What are the four forms of coal?
The four forms of coal are lignite, sub-bituminous, bituminous, and anthracite. These forms differ in their carbon content and energy value, with lignite being the lowest in carbon content and anthracite being the highest.
Is in unburned lump of coal Kendrick energy or potential?
In an unburned lump of coal, the energy is in potential form. When coal is burned, its chemical energy is converted into heat and other forms of energy.
What are coal and oil forms of?
Hydrocarbons
What are the forms of coal called?
Smog
Which element forms both coal and diamonds?
Carbon is the element that forms both coal and diamonds. The difference in their structure and properties is due to the conditions under which they are formed - coal forms under low pressure and temperature, while diamonds form under high pressure and temperature.
Why can't coal form in the arctic?
Coal forms mostly in tropical or temperate regions because it requires abundant plant growth and slow burial to undergo the necessary transformation into coal. The Arctic region has a colder climate and limited plant growth, making it unsuitable for coal formation.
Both lignite and anthracite are forms of?
coal
What are both lignite and anthracite forms of?
coal
Why is coal used for electricity?
When coal burns, it produces heat. This can be converted to other forms of energy.
What element is found in coal or diamonds?
Carbon is the element found in both coal and diamonds.
What forms coal oils and gas?
acid rain
What chemical forms coal?
The principal component is carbon.
What comes in forms and is hard like a rock?
Coal
What comes in many forms and is hard as a rock?
coal
