Ten percent of nothin'

Icebergs in Lake Michigan sometimes have stripes, formed by layers of snow that react to different conditions. Blue stripes are often created when a crevice in the ice sheet  fills up with melt water and freezes so quickly that no bubbles form. When an iceberg falls into the lake, a layer of water can  freeze to the underside. If this is rich in algae, it can form a  green stripe.   Brown, black and yellow lines are caused by sediment, picked up  when the ice sheet grinds downhill towards the lake. 

(via: across)

Notes

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