( ( ( Know ( that ( hydrogen ( is ( ( the ( ( most abundant ) element ) ) ( in ( the universe ) ) ) ) ) ) ) ( -LRB- ( ( and why ) -RRB- ) ) ) ( , ( ( tenth ( in ( abundance ( in ( the earth ) ) ) ) ) ( ( ( ( ( 's crust ) , ) and ) ( ( present ( in ( ( more different ) compounds ) ) ) ( than ( any ( other element ) ) ) ) ) . ) ) ) )
(ROOT (S (S (VP (VBG Know) (SBAR (IN that) (S (NP (NN hydrogen)) (VP (VBZ is) (NP (NP (DT the) (ADJP (RBS most) (JJ abundant)) (NN element)) (PP (IN in) (NP (DT the) (NN universe))))))) (PRN (-LRB- -LRB-) (CC and) (VB why) (-RRB- -RRB-)))) (, ,) (NP (NP (NN tenth)) (PP (IN in) (NP (NP (NN abundance)) (PP (IN in) (NP (DT the) (NN earth)))))) (VP (VP (VBZ 's) (VP (NN crust))) (, ,) (CC and) (VP (ADJP (JJ present) (PP (IN in) (NP (ADJP (RBR more) (JJ different)) (NNS compounds)))) (PP (IN than) (NP (DT any) (JJ other) (NN element))))) (. .)))
Know that hydrogen is the most abundant element in the universe (and why), tenth in abundance in the earth's crust, and present in more different compounds than any other element.
(ROOT (S (NP (NNP Hydrogen)) (VP (VBZ is) (NP (NP (DT the) (ADJP (RBS most) (JJ abundant)) (NN element)) (PP (IN in) (NP (DT the) (NN universe))))) (. .)))