The book considers the inter-relations betweeen plants and minerals in an entirely new way ,in that it introduces the notion of oce-engineering :i.e the manipulation of the mineral world by the living world to the ends of the living world .these inter-relations are the basis for traditional agriculture and should be the basis for new ,encologically …
Coal preparation has its roots in the united states in the late 1800s.the anthracite field in eastern pennsylvania was a major coal producer,providing fuel for home beating ,stokers ,and metallurgical uses.coal was mined by hand and the slate material sparated at the underground working face before it was loaded into a mine car.