( ( Continental crust ) ( ( ( is ( ( ( less dense ) and ) ( typically thicker ) ) ) ( than ( oceanic crust ) ) ) . ) )
(ROOT (S (NP (NNP Continental) (NNP crust)) (VP (VBZ is) (ADJP (ADJP (RBR less) (JJ dense)) (CC and) (ADJP (RB typically) (JJ thicker))) (PP (IN than) (NP (JJ oceanic) (NN crust)))) (. .)))
Continental crust is less dense and typically thicker 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.