Question

I. _________________ is the variety of coal with maximum carbon content. II. Petroleum and natural gas were formed from dead _____. III. The fuel used in jet aeroplanes _______________________. IV. The process of conversion of wood into coal is called _________________. V. The slow process of conversion of dead vegetation into coal is called__________. VI. Coal and petroleum are formed from the dead remains of organisms and are known as __________. VII. The black thick liquid with __________ smell is known as coal tar. VIII. During the processing of coal to get coke, coal tar and __________ are also obtained. IX. The process of separating the various constituents of petroleum is known as __________. X. Excessive burning of fossil fuels is a major cause of __________. XI. When heated in air, coal burns and produces mainly ________ gas.

Answer 1

1. -------
2. zone
3. Aviation
4. ---------
5. carbonisation