( ( Continental crust ) ( ( is ( ( ( ( ( ( much older ) , ) thicker ) and ) ( less dense ) ) ( than ( oceanic crust ) ) ) ) . ) )
(ROOT (S (NP (NNP Continental) (NNP crust)) (VP (VBZ is) (ADJP (ADJP (ADJP (RB much) (JJR older)) (, ,) (ADJP (JJ thicker)) (CC and) (ADJP (RBR less) (JJ dense))) (PP (IN than) (NP (JJ oceanic) (NN crust))))) (. .)))
Continental crust is much older, thicker and less dense than oceanic crust.
(ROOT (S (NP (NNP Gabbro)) (VP (VBZ is) (NP (NP (DT a) (JJ dark) (JJ dense) (NN rock)) (SBAR (WHNP (WDT that)) (S (VP (MD can) (VP (VB be) (VP (VBN found) (PP (IN in) (NP (DT the) (JJ oceanic) (NN crust)))))))))) (. .)))
Gabbro is a dark dense rock that can be found in the oceanic crust.