( ( ( ( ( The ( outer core ) ) ( is ( made ( of ( ( liquid metal ) ( -LRB- ( ( ( iron and ) nickel ) -RRB- ) ) ) ) ) ) ) and ) ( ( the ( inner core ) ) ( is ( ( solid metal ) ( -LRB- ( ( ( iron and ) nickel ) -RRB- ) ) ) ) ) ) . )
(ROOT (S (S (NP (DT The) (JJ outer) (NN core)) (VP (VBZ is) (VP (VBN made) (PP (IN of) (NP (NP (JJ liquid) (NN metal)) (PRN (-LRB- -LRB-) (NP (NP (NN iron)) (CC and) (NP (NN nickel))) (-RRB- -RRB-))))))) (CC and) (S (NP (DT the) (JJ inner) (NN core)) (VP (VBZ is) (NP (NP (JJ solid) (NN metal)) (PRN (-LRB- -LRB-) (NP (NP (NN iron)) (CC and) (NP (NN nickel))) (-RRB- -RRB-))))) (. .)))
The outer core is made of liquid metal (iron and nickel) and the inner core is solid metal (iron and nickel).
(ROOT (S (NP (DT The) (JJ outer) (NN core)) (VP (VBZ is) (VP (VBN made) (PP (IN of) (NP (JJ liquid) (NN metal))))) (. .)))