Why do they form crystals at that temperature?
Are you joking?
Do you know anything
about atoms and how temperature affects them?
If you need to know, the basics is:
Cold= atoms get closer together because they have less energy.
Hot= atoms start moving, bouncing around, moving outwards, because they have more energy.
How is this hard for you to comprehend?
This is the stuff they don't dare speak about in science classrooms.
Humorously, as far as i know, every school explains how atoms form solids, gasses, and liquids.