( There ( ( needs ( to ( be ( ( ( a ( narrow spot ) ) ( in ( the ( geyser ( tube ( or ( plumbing system ) ) ) ) ) ) ) ( that ( ( ( makes ( it ( difficult ( for ( ( the water ) ( to flow ) ) ) ) ) ) , ) ( ( causing heat ) ( to ( build up ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBZ needs) (S (VP (TO to) (VP (VB be) (NP (NP (DT a) (JJ narrow) (NN spot)) (PP (IN in) (NP (DT the) (NN geyser) (NN tube) (CC or) (NN plumbing) (NN system))) (SBAR (WHNP (WDT that)) (S (VP (VBZ makes) (S (NP (PRP it)) (ADJP (JJ difficult) (PP (IN for) (NP (NP (DT the) (NN water)) (PP (TO to) (NP (NN flow))))))) (, ,) (S (VP (VBG causing) (NP (NN heat)) (S (VP (TO to) (VP (VB build) (PRT (RP up))))))))))))))) (. .)))
There needs to be a narrow spot in the geyser tube or plumbing system that makes it difficult for the water to flow, causing heat to build up.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (NN water)) (VP (VP (VBZ is) (VP (VP (VBN heated) (PP (IN by) (NP (NN magma)))) (CC and) (VP (VBZ makes) (NP (PRP$ its) (NN way)) (PP (TO to) (NP (DT the) (NN surface)))))) (CC and) (VP (VBZ creates))))) (NP (DT a) (-LRB- -LRB-) (NN n) (-RRB- -RRB-)) (VP (VBP geyser)) (. .)))