( ( ( ( ( ( Crust ( ( The ( thin ( outer layer ) ) ) ( of ( ( the ( Earth 's ) ) surface ) ) ) ) , ) ( averaging ( ( ( about 10 ) kilometers ) ( thick ( under ( the oceans ) ) ) ) ) ) and ) ( up ( tp ( ( ( about 50 ) kilometers ) ( thick ( on ( the continents ) ) ) ) ) ) ) . )
(ROOT (S (VP (VP (VB Crust) (NP (NP (DT The) (JJ thin) (JJ outer) (NN layer)) (PP (IN of) (NP (NP (DT the) (NN Earth) (POS 's)) (NN surface)))) (, ,) (S (VP (VBG averaging) (NP (NP (QP (RB about) (CD 10)) (NNS kilometers)) (ADJP (JJ thick) (PP (IN under) (NP (DT the) (NNS oceans)))))))) (CC and) (VP (ADVP (RB up)) (VB tp) (NP (NP (QP (RB about) (CD 50)) (NNS kilometers)) (ADJP (JJ thick) (PP (IN on) (NP (DT the) (NN continents))))))) (. .)))
Crust The thin outer layer of the Earth's surface, averaging about 10 kilometers thick under the oceans and up tp about 50 kilometers thick on the continents.
(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))) (. .)))