( Geology ( ( is ( ( ( ( ( ( ( the study ) ( of ( the earth ) ) ) -- ) ( ( ( its composition ) , ) processes ) ) , ) and ) history ) ) . ) )
(ROOT (S (NP (NNP Geology)) (VP (VBZ is) (NP (NP (NP (DT the) (NN study)) (PP (IN of) (NP (DT the) (NN earth)))) (: --) (NP (NP (PRP$ its) (NN composition)) (, ,) (NP (NNS processes))) (, ,) (CC and) (NP (NN history)))) (. .)))
Geology is the study of the earth--its composition, processes, and history.
(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)))))))))) (. .)))