( s ( ( ( ( crust ( by mass ) ) and ) ( is ( ( the ( second ( ( most abundant ) element ) ) ) ( -LRB- ( ( oxygen ( is ( the first ) ) ) -RRB- ) ) ) ) ) . ) )
(ROOT (S (NP (PRP s)) (VP (VP (NN crust) (PP (IN by) (NP (NN mass)))) (CC and) (VP (VBZ is) (NP (NP (DT the) (JJ second) (ADJP (RBS most) (JJ abundant)) (NN element)) (PRN (-LRB- -LRB-) (S (NP (NN oxygen)) (VP (VBZ is) (NP (DT the) (JJ first)))) (-RRB- -RRB-))))) (. .)))
s crust by mass and is the second most abundant element (oxygen is the first).
(ROOT (S (NP (NNP Oxygen)) (VP (VBZ is) (NP (NP (DT the) (NN name)) (PP (IN of) (NP (DT the) (JJ second) (ADJP (RBS most) (JJ electronegative)) (NN element))))) (. .)))