( ( ( The ( four layers ) ) ( of ( the earth ) ) ) ( ( are ( ( ( ( ( ( ( ( the crust ) , ) mantle ) , ) ( outer core ) ) , ) and ) ( the ( inner core ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (CD four) (NNS layers)) (PP (IN of) (NP (DT the) (NN earth)))) (VP (VBP are) (NP (NP (DT the) (NN crust)) (, ,) (NP (NN mantle)) (, ,) (NP (JJ outer) (NN core)) (, ,) (CC and) (NP (DT the) (JJ inner) (NN core)))) (. .)))
The four layers of the earth are the crust , mantle , outer core , and the inner core .
(ROOT (S (NP (NP (DT The) (JJ outer) (NN core)) (PP (IN of) (NP (DT the) (NN earth)))) (VP (VBZ is) (ADJP (JJ molten))) (. .)))