( ( Surface waves ) ( ( travel ( on ( ( the interface ) ( between ( ( water and ) air ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Surface) (NNS waves)) (VP (VBP travel) (PP (IN on) (NP (NP (DT the) (NN interface)) (PP (IN between) (NP (NN water) (CC and) (NN air)))))) (. .)))
Surface waves travel on the interface between water and air.
(ROOT (NP (NP (NNP Ocean) (NNS waves) (NN travel)) (PRN (-LRB- -LRB-) (PRP s) (-RRB- -RRB-)) (PP (IN at) (NP (NP (DT the) (NN interface)) (PP (IN between) (NP (NP (DT the) (NN sea) (NN surface)) (CC and) (NP (DT the) (NN atmosphere)))))) (. .)))