( ( Geological oceanographers ) ( ( study ( ( the ( formations ( , ( composition ( , ( and history ) ) ) ) ) ) ( of ( the seafloor ) ) ) ) . ) )
(ROOT (S (NP (JJ Geological) (NNS oceanographers)) (VP (VBP study) (NP (NP (DT the) (NN formations) (, ,) (NN composition) (, ,) (CC and) (NN history)) (PP (IN of) (NP (DT the) (NN seafloor))))) (. .)))
Geological oceanographers study the formations, composition, and history of the seafloor.
(ROOT (S (SBAR (WHADVP (WRB How)) (S (NP (NN ice) (NNS cores)) (VP (VBP are) (ADJP (JJ important) (PP (TO to) (NP (NP (DT the) (NN study)) (PP (IN of) (NP (JJ geologic) (NN history))))))))) (VP (VBZ is) (ADVP (RBS best)) (VP (VBN described) (SBAR (IN as) (S (NP (PRP they)) (VP (VBP contain) (NP (NN evidence) (NN showing) (NNS changes)) (PP (IN in) (NP (NP (DT the) (JJ atmospheric) (NN composition)) (PP (IN over) (NP (NN time)))))))))) (. .)))