( It ( ( ( can also ) ( be ( ( found trapped ) ( in ( rocks ( in ( ( the ( Earth 's ) ) crust ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (MD can) (ADVP (RB also)) (VP (VB be) (VP (VBN found) (ADJP (JJ trapped)) (PP (IN in) (NP (NP (NNS rocks)) (PP (IN in) (NP (NP (DT the) (NN Earth) (POS 's)) (NN crust)))))))) (. .)))
It can also be found trapped in rocks in 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))))) (. .)))