When you put a Sodium Acetate Crystal in Vinegar/Water, why does it crystallize?what's making it crystallize? (plz do answer in vocabulary that Grade 7's can understand)

I have already graduated from school. I didn't do anyone else's homework then, and I am not doing it now. I suggest you either open your book or use a search engine with that question to find out. Spoon feeding you answers does not help you. Part of your education is not only the obvious answer to the question, but how to find answers on your own.