( ( ( ( ( ( ( Mantle ( A ( rock layer ) ) ) , ) ( about ( 2,894 kilometers ) ) ) thick ) , ) ( between ( ( the ( Earth 's ) ) ( ( crust and ) core ) ) ) ) . )
(ROOT (NP (NP (NP (NNP Mantle)) (NP (DT A) (NN rock) (NN layer)) (, ,) (ADVP (IN about) (NP (CD 2,894) (NNS kilometers)))) (ADJP (JJ thick)) (, ,) (PP (IN between) (NP (NP (DT the) (NN Earth) (POS 's)) (NN crust) (CC and) (NN core))) (. .)))
Mantle A rock layer, about 2,894 kilometers thick, between the Earth's crust and core.
(ROOT (S (NP (NP (NP (DT The) (NN earth) (POS 's)) (JJ continental) (NN crust)) (, ,) (PP (IN on) (NP (NN average))) (, ,)) (VP (VBZ is) (ADJP (NP (CD 35) (NNS kilometers)) (JJ thick))) (. .)))