Topics include the origins of coal (including the types of plants and animals in coal formation), chemical composition of coal, as well as the various techniques used in the mining of coal.
(Topics; include; the origins of coal (including the types of plants and animals in coal formation) (the various techniques; used; L:in the mining of coal)
Topics the various techniques
include used
the origins of coal (including the types of plants and animals in coal formation
L:in the mining of coal