( ( Water ( below ( ( the ( ground 's ) ) surface ) ) ) ( ( is ( called groundwater ) ) . ) )
(ROOT (S (NP (NP (NNP Water)) (PP (IN below) (NP (NP (DT the) (NN ground) (POS 's)) (NN surface)))) (VP (VBZ is) (VP (VBN called) (NP (NN groundwater)))) (. .)))
Water below the ground's surface is called groundwater.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (S (NP (DT the) (NN ground)) (VP (VBZ absorbs) (NP (DT the) (NN water)))) (CC and) (S (NP (PRP it)) (VP (VBZ settles) (PP (IN below) (NP (DT the) (NN surface))))))) (NP (PRP it)) (VP (VBZ is) (VP (VBN called) (NP (NN groundwater)))) (. .)))