( ( ( The ( next layer ) ) ( of ( the Earth ) ) ) ( ( is ( ( referred to ) ( as ( the ( outer core ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ next) (NN layer)) (PP (IN of) (NP (DT the) (NN Earth)))) (VP (VBZ is) (VP (VBN referred) (S (VP (TO to))) (PP (IN as) (NP (DT the) (JJ outer) (NN core))))) (. .)))
The next layer of the Earth is referred to as the outer 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))) (. .)))