Write any two examples of fossil fuels.

Which one of the following is considered as liquid gold?

From what is coal gas obtained?

"We need to use fossil fuels judiciously." Justify the statement.

$(a)$ What is meant by fossil fuel?
$(b)$ Which fossil fuel is usually conserved when we save on electricity?
$(c)$ At the present rate of consumption,how long will the known reserves of coal and petroleum last?

What are fossil fuels? Name any three fossil fuels.