( ( A spring ) ( ( is ( ( any ( natural situation ) ) ( where ( water ( ( flows ( from ( an aquifer ) ) ) ( to ( ( the ( earth 's ) ) surface ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN spring)) (VP (VBZ is) (NP (NP (DT any) (JJ natural) (NN situation)) (SBAR (WHADVP (WRB where)) (S (NP (NN water)) (VP (VBZ flows) (PP (IN from) (NP (DT an) (NN aquifer))) (PP (TO to) (NP (NP (DT the) (NN earth) (POS 's)) (NN surface)))))))) (. .)))
A spring is any natural situation where water flows from an aquifer to the earth's surface.
(ROOT (S (NP (PRP You)) (VP (VBP call) (NP (NP (NN water)) (SBAR (WHNP (WDT that)) (S (VP (VBZ flows) (PRT (RP out)) (PP (IN of) (NP (NP (DT the) (NN ground)) (SBAR (WHADVP (WRB where)) (S (NP (DT an) (NN aquifer)) (VP (VBZ meets) (S (NP (DT the) (NN surface)) (NP (DT a) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN spring))))))))))))) (. .)))
You call water that flows out of the ground where an aquifer meets the surface a(n) spring.