They form by the ponding of meteoric water on the shallow impermeable basin composing the cirque floor. Commonly a shallow bedrock lip dams the water on the down-valley side. Find and name any tarns that your see. With a blue pencil draw a line along each arete. Some geologists might argue that the Knife Edge is not a true arete.
Moraines are glacial deposits laid down along the margins of glaciers.
A long lateral moraine, the Basins Pond moraine , extends SSE from Depot Pond. With a black pencil draw a thick dashed line along the axis of the moraine. Drainage Basins and divides A hydrologic divide is a boundary across which water does not flow. One type of hydrologic divide is a topographic divide. Drainage pattern Drainage pattern is controlled by a number of factors.