The Lauterbrunnen Valley, showing the streams which flow from the mountains 

 forming the sides of the valley, and give rise to waterfalls. 



(Photo by WEHRLI, Zurich.) 



Sand-dunes on Holy Island, Northumberland. Note sands-reeds, and the 

 fact that the surface has no continuous covering of vegetation. 



(Photo by LESSUE NEWBIGIN.) 



