( ( The earth ) ( ( is ( divided ( into ( ( ( three ( main layers ) ) -- ) ( ( ( ( ( a ( hard ( outer crust ) ) ) , ) ( a ( soft ( middle layer ) ) ) ) and ) ( a ( center core ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN earth)) (VP (VBZ is) (VP (VBN divided) (PP (IN into) (NP (NP (CD three) (JJ main) (NNS layers)) (: --) (NP (NP (DT a) (JJ hard) (JJ outer) (NN crust)) (, ,) (NP (DT a) (JJ soft) (JJ middle) (NN layer)) (CC and) (NP (DT a) (NN center) (NN core))))))) (. .)))
The earth is divided into three main layers -- a hard outer crust, a soft middle layer and a center 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))) (. .)))