Assignment 4 ( notes) for class X

Difference between Gond Wana Coal fields & Tertiary coal fields :-

Gond Wana coal fields :

1) Older - 250 million years old .

2) Low percentage of moisture .

3) Contains sulphur and phosphorus in small quantity .

4) High carbon content .

5) Mainly bituminous .

                                   whereas

Tertiary coal fields :

1) Younger - 15 to 60 million years old .

2) High percentage of moisture .

3) Contains large amount of sulphur & phosphorous .

4) Low carbon content .

5) Mainly peat & lignite .