Chemistry
Coal is formed from

Compressed and hardened biomass
Coke
Deposit of animal waste
Crude oil

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Chemistry
Water is not effective in extinguishing a fire caused by petrol because

Water and petrol are miscible with each other
Water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn
The flame is too hot for water to cool it down
Water and petrol react chemically

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