( ( ( ( ( ( most rocks ) ( are ( composed ( of ( ( greater ( ( than 95 ) % ) ) ( silicate minerals ) ) ) ) ) ) , ) and ) ( ( ( ( over 90 ) % ) ( of ( ( the ( Earth 's ) ) crust ) ) ) ( is ( composed ( of ( these minerals ) ) ) ) ) ) . )
(ROOT (S (S (NP (JJS most) (NNS rocks)) (VP (VBP are) (VP (VBN composed) (PP (IN of) (NP (QP (JJR greater) (IN than) (CD 95) (NN %)) (JJ silicate) (NNS minerals)))))) (, ,) (CC and) (S (NP (NP (QP (IN over) (CD 90)) (NN %)) (PP (IN of) (NP (NP (DT the) (NN Earth) (POS 's)) (NN crust)))) (VP (VBZ is) (VP (VBN composed) (PP (IN of) (NP (DT these) (NNS minerals)))))) (. .)))
most rocks are composed of greater than 95% silicate minerals, and over 90% of the Earth's crust is composed of these minerals.
(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))))) (. .)))