Inside was where it was at! He was immediately curious about what would happen, and intently squirted hot water on the snow for a few minutes. The first thing he noticed was that even though he was adding lots of water, the bottom of the pan still contained only frozen snow. He hadn't expected the snow to seemingly absorb the water. So his first mission was to see how much water he could squirt into the snow before pools of water finally formed in the pan. The amount of water it took surprised me too!
When I asked him what the water was doing to the snow, he said, "The hot water is making the cold snow vibrate! When it vibrates, it gets hotter and melts!" Wow. That was quite more of a specific answer than I expected to get!