( ( The atmosphere ) ( ( consists ( of ( ( approximately 78 ) ( percent ( nitrogen gas ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN atmosphere)) (VP (VBZ consists) (PP (IN of) (NP (NP (QP (RB approximately) (CD 78))) (NP (NN percent) (NN nitrogen) (NN gas))))) (. .)))
The atmosphere consists of approximately 78 percent nitrogen gas.
(ROOT (S (NP (NN Nitrogen) (NN gas)) (VP (VBZ comprises) (NP (NP (QP (RB about) (NNS three-fourths))) (PP (IN of) (NP (NP (NN earth) (POS 's)) (NN atmosphere))))) (. .)))