This is an example of a glacial retreat where you can see the darker traces are proof of where more snow had covered the are.
This picture of the Caucasus Mountains above has a Arete erosional form. You can see the "knife like" peaks on the mountains that are separating the glaciers.
In the far back you can see that this has a bowl shaped region, or a cirques.
Why these mountains have these erosional forms is because loose rock is broken off so that the bedrock is visible (Allen, Glacial Forms).
Citations: http://espn.go.com/action/snowboarding/blog/_/post/5440914 http://www.123rf.com/photo_5288781_caucasus-mountains-covered-with-snow-and-ice.html http://www.123rf.com/photo_3914869_caucasus-mountains-dombaj-ski-resort.html http://lj-photophile.livejournal.com/2011/03/01/ http://nl.wikipedia.org/wiki/Sotsji_%28rivier%29
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