( Triton ( ( ( shows ( evidence ( of ( ( a ( dramatic ( geologic history ) ) ) ( with ( ( geyser-like eruptions ) ( of ( nitrogen ( gas ( and ( dust particles ) ) ) ) ) ) ) ) ) ) ) ( into ( its atmosphere ) ) ) . ) )
(ROOT (S (NP (NNP Triton)) (VP (VBZ shows) (NP (NP (NN evidence)) (PP (IN of) (NP (NP (DT a) (JJ dramatic) (JJ geologic) (NN history)) (PP (IN with) (NP (NP (JJ geyser-like) (NNS eruptions)) (PP (IN of) (NP (NN nitrogen) (NN gas) (CC and) (NN dust) (NNS particles)))))))) (PP (IN into) (NP (PRP$ its) (NN atmosphere)))) (. .)))
Triton shows evidence of a dramatic geologic history with geyser-like eruptions of nitrogen gas and dust particles into its atmosphere.
(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)))))))))) (. .)))