( ( On ( steeper beaches ) ) ( , ( ( ( the energy ) ( of ( the wave ) ) ) ( ( can ( be ( ( ( ( ( reflected ( by ( the bottom ) ) ) back ) ( into ( the ocean ) ) ) , ) ( causing ( standing waves ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN On) (NP (JJR steeper) (NNS beaches))) (, ,) (NP (NP (DT the) (NN energy)) (PP (IN of) (NP (DT the) (NN wave)))) (VP (MD can) (VP (VB be) (VP (VBN reflected) (PP (IN by) (NP (DT the) (NN bottom))) (ADVP (RB back)) (PP (IN into) (NP (DT the) (NN ocean))) (, ,) (S (VP (VBG causing) (NP (NN standing) (NNS waves))))))) (. .)))
On steeper beaches, the energy of the wave can be reflected by the bottom back into the ocean, causing standing waves.
(ROOT (S (NP (NNP Low) (NN energy)) (VP (VBZ causes) (S (NP (NNS waves)) (VP (TO to) (VP (VB bring) (NP (NN sand)) (PRT (RP up)) (PP (IN onto) (NP (NP (DT the) (NN beach)) (PP (IN during) (NP (NNS summers))))))))) (. .)))