( ( ( Geology : ) ( ( The study ) ( of ( ( the ( composition ( , ( ( structure and ) history ) ) ) ) ( of ( the earth ) ) ) ) ) ) . )
(ROOT (NP (NP (NNP Geology)) (: :) (NP (NP (DT The) (NN study)) (PP (IN of) (NP (NP (DT the) (NN composition) (, ,) (NN structure) (CC and) (NN history)) (PP (IN of) (NP (DT the) (NN earth)))))) (. .)))
Geology: The study of the composition, structure and history of the earth.
(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)))))))))) (. .)))