Several AERIAL SHOTs and ground shots of eskers (hills of rubble left by glaciers) on tundra. High and low AERIAL SHOTs and ground shots of pingos (dome-shaped mound in permafrost areas). Several AERIAL SHOTs of "polygons" (pattern caused by rising and falling of tundra). AERIAL SHOTs of "raised beaches" (land and water levels altered by melting and shifting of millions of tons of ice and snow).