( ( The crust ) ( ( ( ( is ( thinnest ( beneath ( the oceans ) ) ) ) , ) ( ( averaging ( ( ( only 5 ) kilometers ) ( thick ( , ( and thickest ) ) ) ) ) ( beneath ( large ( mountain ranges ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN crust)) (VP (VBZ is) (NP (NP (JJS thinnest)) (PP (IN beneath) (NP (DT the) (NNS oceans)))) (, ,) (S (VP (VBG averaging) (NP (NP (QP (RB only) (CD 5)) (NNS kilometers)) (ADJP (JJ thick) (, ,) (CC and) (JJ thickest))) (PP (IN beneath) (NP (JJ large) (NN mountain) (NNS ranges)))))) (. .)))
The crust is thinnest beneath the oceans, averaging only 5 kilometers thick, and thickest beneath large mountain ranges.
(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))) (. .)))