Wave refraction. The manner in which waves are refracted on an irregular shoreline. It is assumed that the water is deeper off the bay off the headlands. Consider that the original wabe is divided into three equal segments A-B, B-C, and C-D. Each segment has the same potential energy. But observe that by the time the wave reaches the shore the energy of A-B and C-D has concentrated along the short shoreline of headlands A'-B' and C'-D', while the energy of B-C has been dispersed over a greater front (B'-C') around the bay. Thus there is more energy available for erosion per unit of shoreline on the headlands than there is along the bay. Leet and Judson, 1958, p. 310.

Wave cut cliff indicating old shore of Rush Lake, Sask. Sand and boulders on strand; silt and clay further out in lake.

Wave cut cliff east of Markarfljot where the road runs close to the steep scarp that distinctly demarcates the border between the marine lowlands and the volcanic highlands. August 9, 1960.

Waterfall, MacDonald River, Yellowstone National River, Wyoming.

Waterfall and vegetation covered straight walls of Jurassic sandstone, Boqueron del Padre Abad.

Waterfall and tropical vegetation on almost Jurassic sandstone beds. Boqueron del Padre Abad.

Copy of a watercolour print of "View in The Arctic Regions", by Sir George Back, c. 1838; showing an iceberg and ship.

Diagram of a watercloset in neobabylonian house, showing the application of bitumen. Diagram copied from a book.

Citation reads: "Water skiing on the Mackenzie River by John Hays, RCMP at Fort Good Hope, N.W.T. August 24, 1965."