( Infiltration ( ( is ( ( the process ) ( where ( water ( seeps ( into ( the ground ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Infiltration)) (VP (VBZ is) (NP (NP (DT the) (NN process)) (SBAR (WHADVP (WRB where)) (S (NP (NN water)) (VP (VBZ seeps) (PP (IN into) (NP (DT the) (NN ground)))))))) (. .)))
Infiltration is the process where water seeps into the ground.
(ROOT (S (NP (NP (NNP Water)) (VP (VBG seeping) (PP (IN into) (NP (DT the) (NN ground))))) (VP (VBZ is) (VP (VBN known) (PP (IN as) (NP (NN infiltration))))) (. .)))