( ( ( Continental ( crust averages ) ) ( about 35 ) ) ( ( km thick ) . ) )
(ROOT (S (NP (NP (JJ Continental) (NN crust) (NNS averages)) (PP (IN about) (NP (CD 35)))) (VP (VBP km) (ADJP (JJ thick))) (. .)))
Continental crust averages about 35 km thick.
(ROOT (S (NP (NP (NP (DT The) (NN earth) (POS 's)) (JJ continental) (NN crust)) (, ,) (PP (IN on) (NP (NN average))) (, ,)) (VP (VBZ is) (ADJP (NP (CD 35) (NNS kilometers)) (JJ thick))) (. .)))