Question

Coal is the most abundant fossil fuel on the earth.

a. How did the fossil fuels originate? 

b. Which is the main constituent of coal? 

c. What are the substances obtained when coal is allowed to undergo distillation in the absence of air?

d. How does the excessive use of fossil fuels cause global warming?

Answer 1

a. Plants and animals that went under the earth many years ago changed into fossil fuels by undergoing changes under high pressure, high temperature, and absence of oxygen. 

b. Carbon 

c. Ammonia, coal gas, coal tar, coke 

d. The greenhouse gases given out by the burning of fossil fuels increase the temperature of atmosphere and causes global warming