( ( Black Coal ) ( ( ( is ( ( ( a ( solid rock ) ) and ) ( forms ( from ( brown coal ) ) ) ) ) ( after ( ( ( ( greater heat ) and ) pressure ) ( have ( been applied ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Black) (NNP Coal)) (VP (VBZ is) (NP (NP (DT a) (JJ solid) (NN rock)) (CC and) (NP (NP (NNS forms)) (PP (IN from) (NP (JJ brown) (NN coal))))) (SBAR (IN after) (S (NP (NP (JJR greater) (NN heat)) (CC and) (NP (NN pressure))) (VP (VBP have) (VP (VBN been) (VP (VBN applied))))))) (. .)))
Black Coal is a solid rock and forms from brown coal after greater heat and pressure have been applied.
(ROOT (S (NP (PRP We)) (VP (VBP call) (NP (NP (DT the) (JJ solid) (NN form)) (PP (IN of) (NP (JJ hydrocarbons) (NN coal))))) (. .)))