Gas -> liquid -> solid Solid -> gas -> liquid Liquid -> gas -> solid Solid -> liquid -> gas
I gave my students this multiple choice question: Which of these shows how frozen water changes as the temperature of the air increases?

Only one answer is correct among these 4 choices:
- Gas -> liquid -> solid
- Solid -> gas -> liquid
- Liquid -> gas -> solid
- Solid -> liquid -> gas

Could you tell me which one is correct?

Solid -> liquid -> gas