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This is due to the presence of suspended fine sediment in the water produced by the abrasion of glaciers rubbing against rock, called “glacier milk”.

The glacier milk which colors the streams that flow from beneath it finally settles and makes clay.

Off the great Malaspina Glacier in Alaska the ocean is tinged by the glacier milk for nearly fifty miles from the shores.

"Glacier milk" the Swiss call this muddy water, the gray color of whose silt proves it rock flour freshly ground by the ice from the unoxidized sound rock of its bed, the mud of streams being yellowish when it is washed from the oxidized mantle of waste.