( ( A geyser ) ( ( indicates ( ( ( a ( ( spring or ) body ) ) ( of water ) ) ( that ( is ( heated ( by ( a ( geothermal source ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN geyser)) (VP (VBZ indicates) (NP (NP (DT a) (NN spring) (CC or) (NN body)) (PP (IN of) (NP (NN water))) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (VP (VBN heated) (PP (IN by) (NP (DT a) (JJ geothermal) (NN source))))))))) (. .)))
A geyser indicates a spring or body of water that is heated by a geothermal source.
(ROOT (S (NP (NNS Geysers)) (VP (VBP are) (VP (VBN created) (SBAR (WHADVP (WRB when)) (S (NP (NN water)) (VP (VBZ is) (VP (VBN heated) (PP (IN beneath) (NP (NP (DT the) (NN earth) (POS 's)) (NN surface))))))))) (. .)))