( ( Oceanic crust ) ( ( ( ( is ( ( 7-10 km ) thick ) ) , ) ( while ( ( continental crust ) ( is ( ( 35-70 km ) thick ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Oceanic) (NNP crust)) (VP (VBZ is) (ADJP (NP (CD 7-10) (NNS km)) (JJ thick)) (, ,) (SBAR (IN while) (S (NP (JJ continental) (NN crust)) (VP (VBZ is) (ADJP (NP (CD 35-70) (NNS km)) (JJ thick)))))) (. .)))
Oceanic crust is 7-10 km thick, while continental crust is 35-70 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))) (. .)))