( ( Anyone ( who ( has ( seen ( ( ( a geyser ) or ) ( hot spring ) ) ) ) ) ) ( immediately ( ( thinks ( of heat ) ) . ) ) )
(ROOT (S (NP (NP (NN Anyone)) (SBAR (WHNP (WP who)) (S (VP (VBZ has) (VP (VBN seen) (NP (NP (DT a) (NN geyser)) (CC or) (NP (JJ hot) (NN spring)))))))) (ADVP (RB immediately)) (VP (VBZ thinks) (PP (IN of) (NP (NN heat)))) (. .)))
Anyone who has seen a geyser or hot spring immediately thinks of heat.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (NN magma)) (VP (VBZ heats) (NP (NN groundwater))))) (, ,) (NP (PRP it)) (VP (MD may) (VP (VB come) (PP (TO to) (NP (NP (DT the) (NN surface)) (PP (IN as) (NP (NP (DT a) (JJ hot) (NN spring)) (CC or) (NP (DT a) (NN geyser)))))))) (. .)))