( Snow ( ( forms ( high ( in ( ( the atmosphere ) ( with ( ( ( ( the help ) ( of particles ) ) , ) ( such ( as ( ( ( ( dust , ) ( volcanic ash ) ) or ) ( sea salt ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Snow)) (VP (VBZ forms) (ADJP (JJ high) (PP (IN in) (NP (NP (DT the) (NN atmosphere)) (PP (IN with) (NP (NP (DT the) (NN help)) (PP (IN of) (NP (NNS particles))) (, ,) (PP (JJ such) (IN as) (NP (NP (NN dust)) (, ,) (NP (JJ volcanic) (NNS ash)) (CC or) (NP (NN sea) (NN salt)))))))))) (. .)))
Snow forms high in the atmosphere with the help of particles, such as dust, volcanic ash or sea salt.
(ROOT (S (NP (JJ Volcanic) (NNS gases)) (VP (VBP helpe) (S (VP (TO to) (VP (VB form) (NP (DT the) (NN atmosphere)) (PP (IN on) (NP (NN earth))))))) (. .)))