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Notice the stain?

Much of the ice is stained with sediment, which Canadian scientists say is typical and may be caused by tides stirring up sediment that gets into the ice and concentrates on the surface as the ice melts. https://go.nasa.gov/3CDnT9l
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in reply to NASA

I suspect that this happens slowly because the sediment is not reflective like clean ice.

Sort of like Frost Lift.

hXXps://en.m.wikipedia.org/wiki/Frost_heaving

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