18. (a) What is meant by fossil fuels ?
(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?
Answers
Answer:
Suppose, soap water fall on floor accidently. Can you walk on this floor properly? Write your
answer with reason.
Answer:
a)Fossil fuels are made from decomposing plants and animals. These fuels are found in the Earth's crust and contain carbon and hydrogen, which can be burned for energy. Coal, oil, and natural gas are examples of fossil fuels. ... This material is heated in order to produce the thick oil that can be used to make gasoline.
b)Coal is mainly used to produce electricity.so,when we save electricity, then the consumption of coal will be automatically reduced. so, the fossil fuel usually conserved is COAL.
c)At the current rate of consumption, the current U. S. petroleum, natural gas, and coal reserves will last approximately for 4.88 years, 12.2 years, and 258 years, respectively