( ( ( ( ( Geyser activity ) , ) ( like ( all ( hot ( spring activity ) ) ) ) ) , ) ( ( is ( caused ( by ( ( surface water ) ( gradually ( ( ( seeping down ) ( through ( the ground ) ) ) ( until ( it ( meets ( rock ( heated ( by magma ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Geyser) (NN activity)) (, ,) (PP (IN like) (NP (DT all) (JJ hot) (NN spring) (NN activity))) (, ,)) (VP (VBZ is) (VP (VBN caused) (PP (IN by) (S (NP (NN surface) (NN water)) (ADVP (RB gradually)) (VP (VBG seeping) (PRT (RP down)) (PP (IN through) (NP (DT the) (NN ground))) (SBAR (IN until) (S (NP (PRP it)) (VP (VBZ meets) (ADJP (NN rock) (JJ heated) (PP (IN by) (NP (NN magma)))))))))))) (. .)))
Geyser activity, like all hot spring activity, is caused by surface water gradually seeping down through the ground until it meets rock heated by magma.
(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)) (. .)))