Question

The substances W is a fossil fuel. It occurs deep below the ground in certain areas of the earth. Another fossil fuel X is found trapped above the deposits of W.​

Answer 1

Answer:

Petroleum, natural gas, refining, kerosene

Explanation:

• (a) The substances W is a fossil fuel. It occurs deep below the ground in certain areas of the earth. So W is petroleum.

• Another fossil fuel X is found trapped above the deposits of W. X is natural gas.

• (b) Physical state of W is liquid. Physical state of X is gas.

• (c) When W is subjected to a process called Y, then a number of different products are collected at different temperature ranges which are put to different uses. Y is refining of petroleum.

• (d) A special grade of product Z obtained in this way is used as an aviation fuel in jet aero planes. So Z is kerosene.