For ours, we made quick playdough: 1 cup flour, 1/2 c. salt, 2 T. cream of tartar, 2 T. oil, and 1 cup minus 1 T. water. Cook it on medium-low heat until it forms a ball. We added red, blue, and yellow food coloring to make it brown (not that you can tell here), a quick color blending lesson.
Next, my son formed it into a mini volcano, making a cavity inside.
We placed baking soda inside the hole. The more, the better.
We added a little food coloring to some vinegar to make it more magma-looking, though discovered too late that we didn't need this much vinegar; the end result was more watery than fizzy.
Pour the vinegar into the hole, and you've got a little eruption. This is a good time to remind that the mantle and magma heat up, the expansion causing pressure--like the fizz of our mini-volcano--till the volcano can't contain it anymore.
Pour the vinegar into the hole, and you've got a little eruption. This is a good time to remind that the mantle and magma heat up, the expansion causing pressure--like the fizz of our mini-volcano--till the volcano can't contain it anymore.
The whole experience took about ten to fifteen minutes, and occupied all of my other kids. Now that's my kind of science experiment.
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