( ( ( ( a ( liquid mantle ) ) , ) ( ( ( ( ( a ( solid ( outer core ) ) ) , ) ( a ( plastic ( inner core ) ) ) ) and ) ( a ( solid crust ) ) ) ) . )
(ROOT (NP (NP (DT a) (JJ liquid) (NN mantle)) (, ,) (NP (NP (DT a) (JJ solid) (JJ outer) (NN core)) (, ,) (NP (DT a) (JJ plastic) (JJ inner) (NN core)) (CC and) (NP (DT a) (JJ solid) (NN crust))) (. .)))
a liquid mantle, a solid outer core, a plastic inner core and a solid crust.
(ROOT (S (NP (DT The) (JJ outer) (NN core)) (VP (VBZ is) (VP (VBN made) (PP (IN of) (NP (JJ liquid) (NN metal))))) (. .)))