( ( Oceanic crust ) ( ( is ( ( ( more dense ) and ) ( typically ( thinner ( than ( continental crust ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Oceanic) (NNP crust)) (VP (VBZ is) (ADJP (ADJP (RBR more) (JJ dense)) (CC and) (ADJP (RB typically) (JJR thinner) (PP (IN than) (NP (JJ continental) (NN crust)))))) (. .)))
Oceanic crust is more dense and typically thinner than continental 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.