Amazing striped icebergs

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.

Not my photo, but I thought it was cool enough to share. A bunch more are at the link: http://dbsail.org/Icebergs/Icebergs.html