A handful of rock flour, or glacial flour, scooped up at Mendenhall Lake on Wednesday, June 27, 2018. (Michael Penn | Juneau Empire)

A handful of rock flour, or glacial flour, scooped up at Mendenhall Lake on Wednesday, June 27, 2018. (Michael Penn | Juneau Empire)

Curious by Nature: What is glacial flour?

The Mendenhall Glacier produces a ton of it

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