Question
Question 18
(a) The slow process of conversion of dead vegetation into coal is called___.
(b) Coal and petroleum are formed from the dead remains of organisms and are known as ___.
(c) The black thick liquid with ___ smell is known as coal tar
(d) During the processing of coal to get coke, coal tar and ___ are also obtained.
(e) The process of separating the various constituents of petroleum is known as ___.
(f) Excessive burning of fossil fuels is a major cause of ___.