( ( These materials ) ( ( ( ( ( ( ( escape ( as ( gas bubbles ) ) ) , ) ( dissolve ( in ( the water ) ) ) ) , ) or ) ( float ( to ( the ( water surface ) ) ) ) ) . ) )
(ROOT (S (NP (DT These) (NNS materials)) (VP (VP (VB escape) (PP (IN as) (NP (NN gas) (NNS bubbles)))) (, ,) (VP (VB dissolve) (PP (IN in) (NP (DT the) (NN water)))) (, ,) (CC or) (VP (VB float) (PP (TO to) (NP (DT the) (NN water) (NN surface))))) (. .)))
These materials escape as gas bubbles, dissolve in the water, or float to the water surface.
(ROOT (S (NP (NNP Gas) (NN bubble) (NNS holes)) (VP (VBZ helps) (NP (NP (JJ pumice) (NN float)) (PP (IN in) (NP (NN water))))) (. .)))