( ( ( Earth 's ) ( four ( compositional layers ) ) ) ( ( are ( ( ( ( the crust ) ( -LRB- ( ( ( ( ( brittle , ) solid ) , ) coolest ) -RRB- ) ) ) , ) ( ( ( ( ( ( mantle ( -LRB- ( ( ( plastic , ) ( in ( ( ( ( partially melted ) form ) , ) ( warmer ( than crust ) ) ) ) ) -RRB- ) ) ) , ) ( ( outer core ) ( -LRB- ( ( ( ( ( fluid , ) molten ) , ) hot ) -RRB- ) ) ) ) , ) and ) ( ( inner core ) ( -LRB- ( ( ( ( ( solid , ) densest ) , ) hottest ) -RRB- ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Earth) (POS 's)) (CD four) (JJ compositional) (NNS layers)) (VP (VBP are) (NP (NP (NP (DT the) (NN crust)) (PRN (-LRB- -LRB-) (NP (NNP brittle)) (, ,) (NP (JJ solid)) (, ,) (NP (NN coolest)) (-RRB- -RRB-))) (, ,) (NP (NP (NP (NN mantle)) (PRN (-LRB- -LRB-) (NP (NP (NN plastic)) (, ,) (PP (IN in) (NP (NP (ADJP (RB partially) (JJ melted)) (NN form)) (, ,) (NP (NP (JJR warmer)) (PP (IN than) (NP (NN crust))))))) (-RRB- -RRB-))) (, ,) (NP (NP (JJ outer) (NN core)) (PRN (-LRB- -LRB-) (NP (NN fluid)) (, ,) (NP (NN molten)) (, ,) (NP (JJ hot)) (-RRB- -RRB-))) (, ,) (CC and) (NP (NP (JJ inner) (NN core)) (PRN (-LRB- -LRB-) (NP (NP (JJ solid)) (, ,) (NP (NN densest)) (, ,) (NP (JJS hottest))) (-RRB- -RRB-)))))) (. .)))
Earth's four compositional layers are the crust (brittle, solid, coolest), mantle (plastic, in partially melted form, warmer than crust), outer core (fluid, molten, hot), and inner core (solid, densest, hottest).
(ROOT (S (NP (NP (DT The) (JJ outer) (NN core)) (PP (IN of) (NP (DT the) (NN earth)))) (VP (VBZ is) (ADJP (JJ molten))) (. .)))