Thursday, March 17, 2011

Amazing Iceburgs in Lake Michigan

My sister-in-law sent these pictures of amazing icebergs and I wanted to share them with you.

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 toward the lake.

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