( ( ( ( The ( Moon 's ) ) ( crust averages ) ) ( ( 68 kilometers ) thick ) ) ; )
(ROOT (NP (NP (NP (NP (DT The) (NNP Moon) (POS 's)) (NN crust) (NNS averages)) (ADJP (NP (CD 68) (NNS kilometers)) (JJ thick))) (: ;)))
The Moon's crust averages 68 kilometers 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))) (. .)))