Which is not a variety of coal? |
|||||||
(a) |
Anthracite |
(b) |
Bituminous |
(c) |
Lemonite |
(d) |
Lignite |
Which is not a variety of coal? |
|||||||
(a) |
Anthracite |
(b) |
Bituminous |
(c) |
Lemonite |
(d) |
Lignite |