( ( The ( outer core ) ) ( ( ( ( ( extends ( from ( ( ( 2500 to ) 3500 ) miles ) ) ) ( below ( ( the ( earth 's ) ) surface ) ) ) and ) ( is ( liquid metal ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ outer) (NN core)) (VP (VP (VBZ extends) (PP (IN from) (NP (QP (CD 2500) (TO to) (CD 3500)) (NNS miles))) (PP (IN below) (NP (NP (DT the) (NN earth) (POS 's)) (NN surface)))) (CC and) (VP (VBZ is) (ADJP (JJ liquid) (NN metal)))) (. .)))
The outer core extends from 2500 to 3500 miles below the earth's surface and is liquid metal.
(ROOT (S (NP (DT The) (JJ outer) (NN core)) (VP (VBZ is) (VP (VBN made) (PP (IN of) (NP (JJ liquid) (NN metal))))) (. .)))