curious vicarious volcano

I always wanted one of these, but I thought $15 for a plastic form and some sandy plaster (that I could get from Hobby Lobby for $2) was stupid. At Goodwill last week, I saw a complete, unused kit for $1.25. Score! All my earth building dreams fulfilled:

The boy had fun, too. I am hoping for some seismic activity and ash clouds today. (OK, so it’s baking soda and vinegar. Whatever.)