Avalanche Creek-Glacier N.P. Montana

As the melt water from a glacier starts to flow in the spring time it carries with it glacier silt or rock flour. The silt is created when rocks underneath the surface of the ice are grinding from the movement of the glacier. The rock flour is very light and stays suspended in the water for a long time. The sunlight that reflects off these particles is what gives the lakes their spectacular turquoise blue or green colour.

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