Question

state the physical feature of coel​

Answer 1

Answer:

Coal is a sedimentary rock formed in wide, low-lying equatorial swamps crossed by large rivers and covered by forests of primitive trees. Here, the remains of trees and plants were saved from biodegration and oxidation by mud and water. Coal is usually black in colour but sometimes it occurs as a brownish-black colour. There are four broad ranks or types of coal depending upon its age. Commencing with the youngest and lowest carbon content, these are: lignite, sub-bituminous, bituminous and anthracite. Anthracite is classified as a metamorphic rock because of its subsequent exposure to elevated pressures and temperatures. Bitumen obtained from bituminous coal is a black viscous material generally referred to as 'tar'. Coal is primarily composed of carbon, along with a range of other elements, particularly sulphur. It has been estimated that a coal seam 1 foot thick needed as much as 7 to 10 feet of peat thickness .

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