( This ( ( is ( ( a picture ) ( of ( ( geysers and ) ( hot springs ) ) ) ) ) . ) )
(ROOT (S (NP (DT This)) (VP (VBZ is) (NP (NP (DT a) (NN picture)) (PP (IN of) (NP (NP (NNS geysers)) (CC and) (NP (JJ hot) (NNS springs)))))) (. .)))
This is a picture of geysers and hot springs.
(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)))))))) (. .)))