( ( The ( lunar crust ) ) ( ( ( ( is ( rich ( in ( the ( mineral plagioclase ) ) ) ) ) and ) ( has ( ( an ( average ( crustal thickness ) ) ) ( of ( ( ( 60-70 kilometers ) , ) ( which ( ( is ( ( about 3 ) times ) ) ( ( the ( average ( crustal thickness ) ) ) ( on Earth ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN lunar) (NN crust)) (VP (VP (VBZ is) (ADJP (JJ rich) (PP (IN in) (NP (DT the) (NN mineral) (NN plagioclase))))) (CC and) (VP (VBZ has) (NP (NP (DT an) (JJ average) (JJ crustal) (NN thickness)) (PP (IN of) (NP (NP (CD 60-70) (NNS kilometers)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (ADVP (QP (RB about) (CD 3)) (NNS times)) (NP (NP (DT the) (JJ average) (JJ crustal) (NN thickness)) (PP (IN on) (NP (NNP Earth)))))))))))) (. .)))
The lunar crust is rich in the mineral plagioclase and has an average crustal thickness of 60-70 kilometers, which is about 3 times the average crustal thickness on Earth.
(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))) (. .)))