Lately, we have been spending some time exploring mud, sand, and rocks. As we continue to learn about geology we decided to take a look at Geysers. First, we looked at some photos from our family vacation to Yellowstone National Park specifically Dane was able to tell the children about visiting Old Faithful. Then we watched the National Park Service's Live Webcam at Old Faithful. Unfortunately, we were not able to catch the Geyser erupting. Instead of waiting we were able to find some great recorded footage online from geology.com . Now, it was time for us to make a geyser for ourselves. (Instructions for this can be found at Steve Spangler Science .) We didn't have the fancy contraption to make loading the mentos easier, so we made a narrow funnel out of a piece of copy paper. Then we punched holes in each side of it and placed a paint brush in the hole to keep the mentos from falling into the diet coke before we were ready. After we gathered our materials and talked about ...