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This is a lesson about volcanic activity. Learners will make volcanic eruptions using baking soda and vinegar, and then use colored play dough to make a record of the flow patterns. Then, groups of learners exchange their volcanoes so they can make maps, take core samples, and record and interpret the history of the volcano, based on the maps and observations. This is activity C-15 as part of Universe at Your Fingertips 2.0: A Collection of Activities and Resources for Teaching Astronomy DVD-ROM, which is available for purchase.