Which planet shows evidence of water erosion?

The planet which shows evidence of water erosion is Mars. Scientists discovered that Mars is the only other planet which has evidences of water existance as Mars' atmosphere contains trace amounts of water vapor, and it surprisingly turned out that it also has polar ice caps which are filled with frozen H2O. And, as you may have heart, Mars has shown many evidences of past river valleys and lakes.

3is a crest4 is a trough 2 is the amplitude 1 is the wavelength

He can play two games. 13/4=3.253.25*2=6.5