Not far after we first start to see real glaciers on the mountains surrounding the highway, we come to this beautiful emerald lake. It is filled with 'glacial flour', which is the term used for tiny particles of rock suspended in the water. This rock powder has been formed by the erosive force of a glacier against its bed. This in turn is carried by glacial meltwater into the lake.
This image is from the presentation "Rockies Mountaineering - Mt Athabasca - Yamnuska Snow + Ice Long Weekend".
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