( ( Key concepts ) ( ( ( include ( scientific evidence ) ) ( for ( ( atmospheric changes ) ( over ( geologic time ) ) ) ) ) ; ) )
(ROOT (S (NP (NNP Key) (NNS concepts)) (VP (VBP include) (NP (JJ scientific) (NN evidence)) (PP (IN for) (NP (NP (JJ atmospheric) (NNS changes)) (PP (IN over) (NP (JJ geologic) (NN time)))))) (: ;)))
Key concepts include scientific evidence for atmospheric changes over geologic time;
(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)))))))))) (. .)))