( ( Most ( of ( ( the evidence ) ( for ( an ( ancient Earth ) ) ) ) ) ) ( ( is ( contained ( in ( ( the rocks ) ( that ( form ( ( the ( Earth 's ) ) crust ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJS Most)) (PP (IN of) (NP (NP (DT the) (NN evidence)) (PP (IN for) (NP (DT an) (JJ ancient) (NN Earth)))))) (VP (VBZ is) (VP (VBN contained) (PP (IN in) (NP (NP (DT the) (NNS rocks)) (SBAR (WHNP (WDT that)) (S (VP (VBP form) (NP (NP (DT the) (NN Earth) (POS 's)) (NN crust))))))))) (. .)))
Most of the evidence for an ancient Earth is contained in the rocks that form the Earth's crust.
(ROOT (S (NP (NP (DT The) (NN earth) (POS 's)) (NN crust)) (VP (VBZ is) (VP (VBN composed) (PP (IN of) (NP (JJ igneuos) (NN rock))))) (. .)))