Description : Coal is formed from – (1) crude oil (2) deposit of animal waste (3) coke (4) compressed and hardened biomass
Last Answer : (4) compressed and hardened biomass Explanation: A fossil fuel, coal forms when dead plant matter is converted into peat, which in turn is converted into lignite, then subbituminous coal, ... lastly anthracite: This involves biological and geological processes that take place over a long period.