
Mountain lakes are the result of the action and the moving of glaciers. By moving, the glacier digs the ground. When it comes across a hard rock, the glacier bypasses it. It can go over it and dig through once it passes the obstacle. At the rear, the glacier leaves in front of the hard rocks encountered previously, a basin closed in front by the mountain glacier and in the back by the mountain. These are the glacial lakes. Other glacial lakes exist such as moraines. But this is another story.