In the winter our toddler class gathered snow in a 5 gal bucket. They brought it inside and built a snowman in a large shallow baking pan. They put on eyes, arms, nose, buttons (not real buttons) and scarf. They then placed the snowman on the table to watch it melt through the process of the day. Every child in the center made trips to the toddler room that day to see what was happening to the snowman. This was a great hands-on sensory-science project. The kids loved it!