Every classroom needs a Teaching Tornado. Finally, a weather related phenomenon that comes right into the classroom. Your students will love this demonstration model that teaches the principles of how tornadoes form. Students will learn about how a strong updraft is important, about convergence and rotation, about funnel speed and how it is related to funnel width and many more exciting tornado facts. Comes with a teacher’s guide. Guide includes 7 fascinating experiments. Dry ice is not necessary to complete this experiment.