What causes the sides/bottom of ice cream to get icy?

What causes the bottom/sides of ice cream in cartons to get icy?What causes the sides/bottom of ice cream to get icy?
The sides/bottom are the first to melt, and then re-freeze. The milkfat moves in towards the center, or drips onto your freezer floor, leaving behind ice crystals.What causes the sides/bottom of ice cream to get icy?
It is not exposed to heat....the milk fat from the ice cream moves in towards the center, ice crystals form.....and it stays frozen.
the freezer (duh)





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I belive that's when it's starting to get freezerburnt.

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