metamorphism

I was struck by the similarity of these two images. Which one does your dentist want you to eat? I won't speculate about anyone's dentist's motivations, but the top image comes from The Science of Ice Cream, and the bottom from the USGS. I'm not sure what conditions the ice cream was stored under, but the USGS image is from a limestone that had been stored next to a piping hot intrusion of monzonite, and partially baked into marble. Frozen desserts left in the freezer too long will undergo a similar process. The edges of each ice crystal are constantly exchanging water with the sugar…