( ( The ( radar finding ) ) ( ( ( is important ) ( as ( scientists ( use ( ( Antarctic ( ice cores ) ) ( to ( ( understand ( changes ( in ( atmospheric ( chemistry ( , ( ( temperature and ) precipitation ) ) ) ) ) ) ) ( through ( ( long periods ) ( of history ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN radar) (NN finding)) (VP (VBZ is) (ADJP (JJ important)) (SBAR (IN as) (S (NP (NNS scientists)) (VP (VBP use) (S (NP (JJ Antarctic) (NN ice) (NNS cores)) (VP (TO to) (VP (VB understand) (NP (NP (NNS changes)) (PP (IN in) (NP (JJ atmospheric) (NN chemistry) (, ,) (NN temperature) (CC and) (NN precipitation)))) (PP (IN through) (NP (NP (JJ long) (NNS periods)) (PP (IN of) (NP (NN history)))))))))))) (. .)))
The radar finding is important as scientists use Antarctic ice cores to understand changes in atmospheric chemistry, temperature and precipitation through long periods of 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)))))))))) (. .)))