( F ( ( ( ( waters ( that bubble ) ) up ) ( from ( ( a hole ) ( in ( the ground ) ) ) ) ) . ) )
(ROOT (S (NP (NN F)) (VP (VBZ waters) (NP (DT that) (NN bubble)) (PRT (RP up)) (PP (IN from) (NP (NP (DT a) (NN hole)) (PP (IN in) (NP (DT the) (NN ground)))))) (. .)))
F waters that bubble up from a hole in the ground.
(ROOT (S (NP (NNP Gas) (NN bubble) (NNS holes)) (VP (VBZ helps) (NP (NP (JJ pumice) (NN float)) (PP (IN in) (NP (NN water))))) (. .)))