( ( ( ( cloud ( condensation ( nuclei ( and ( ice nuclei ) ) ) ) ) , ) ( the ( Bergeron process ) ) ) . )
(ROOT (NP (NP (NN cloud) (NN condensation) (NNS nuclei) (CC and) (NN ice) (NNS nuclei)) (, ,) (NP (DT the) (JJ Bergeron) (NN process)) (. .)))
cloud condensation nuclei and ice nuclei, the Bergeron process.
(ROOT (S (NP (NNP Condensation)) (VP (MD must) (VP (VB occur) (PP (IN for) (NP (NNS clouds))) (S (VP (TO to) (VP (VB form)))))) (. .)))