7. Pictures of water erosion A river is an effect of water erosion http:// www.mbgnet.net / This is an oxbow lake. It is also something that happens from water erosion. http://www.earthscienceworld.org/images/search/index.html This is a waterfall. http:// www.waterfallsnorthwest.com / A delta (above) is a deposit by rivers. There are stalagmites and stalactites in this cave and they are caused from groundwater erosion.