Glaciers built our landscapes, grinding rocks to "glacial flour" as they advanced and then dropping it hill-high in piles as they retreated.

The stream issuing from the glacier will then become clearer as glacial flour diminishes.

Moraines may be composed of debris ranging in size from silt-sized glacial flour to large boulders.

Moraines may be made of silt like glacial flour to large boulders.

Some mountain lakes and streams with finely ground rock, such as glacial flour, are turquoise.

Muncho Lake (of blue-green color, due to glacial flour)

The glacial feed to the lakes gives them a distinctive blue colour, created by glacial flour, the extremely finely ground rock particles from the glaciers.

Abrasion produces fine sediment, termed glacial flour.

Gray-green with glacial flour, the Madwoman River poured noisily into a bay where whitecaps danced on water the hue of steel.

The glaciers grind rock into a fine glacial flour which turns the Hoh River a milky slate blue color.