GLACIERS AND LAKES 



245 



FIG. 129. GLACIERS IN A VALLEY IN SWITZERLAND 



This is a summer view of peaks perpetually covered with snow. 1. A 

 glacier fills a steep valley between the peaks. What seems to be its lower 

 limit in winter? 2. Why are there so many waterfalls among the Alps? 



265. The Work of Moving Ice. Rock waste beneath 

 the glacier becomes frozen into the ice and is like a 



