Question

Coal is formed from the remains of:
(A). vegetation only
(B). animals only
(C). both vegetation and animals
(D). neither vegetation nor animals

Answer 1

Hint: To develop the coal inside the earth it takes millions of years and the amount of the coal is limited hence it is a non-renewable source of energy. Formation of the coal takes place in the swampy wetland where groundwater is near or slightly above the topsoil. Due to this the flora present in these areas produces the coal fatter than it can be decomposed.

Complete step-by-step answer:
Coal beds are consisting of the altered plant remains. When forest swamp died then they sank below the water and then the process of formation of the coal started. The amount of the vegetation which is needed for the formation of the coal must be huge and it should be buried, compressed and protected from the erosion and all the biological, geographic and climate factors must be favourable. The temperature and the pressure must be higher for the formation of the coal.
Hence from the above discussion we came to know that the coal is formed from the remains of vegetation only.
So, the option (A) is the correct answer.

Note: Coal formation takes place in the stages namely peat, bituminous and anthracite and these stages are dependent on the atmosphere and the condition inside the earth when they get buried. The rank of the coal will be higher if the pressure and the heat is higher. The coal of the higher ranks will be denser and contains less moisture and gases and also, they will burn at the higher temperature and the heat produced by them will be more efficient and durable.