Geography
A ribbon lake, Lake Washington is long, narrow and finger-like. Ribbon lakes are excavated by glaciers. As the Puget lobe of the Cordilleran Ice Sheet flowed south near the end of the Late Pleistocene, it met bands of harder and softer rock. Erosion of the softer rock was faster and a linear depression was created in the flow direction. When the glacier melted, the lake filled with the meltwater, which was retained by moraine deposits. A dam can also be created by the bands of harder rock either side of the softer rock. There is usually a river at both ends of a ribbon lake, one being the inlet, and the other, the outlet — though in the case of present day Lake Washington, inlet rivers are located at both ends.
Read more about this topic: Lake Washington
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