Jackson might even call this one of the "FUNNEST" activities ever! We started with two plastic cups filled 1/2 way with water... Added a few bits of food, and let it sit in the freezer for a day or so, making it ROCK SOLID! (Obviously, teaching a lesson all about solids/liquids, etc., but you all knew that...)
THEN, we helped it melt. :) This video will help clarify.
Oh, and the "white raisins" are actually yogurt covered raisins - they've just been "named" that since they first enjoyed them at Grandma's and Pa's house last summer.