Shake the jar and observe. (You may have to shake the jar a few
different ways to find out what works best for you. We found
that holding the jar upright and shaking in a counter clockwise
circular fashion worked best for us.)
Record what you see.
What do you think happened?
What do you think will happen if you add some glitter or small
bits of tin foil to the jar? Give it a try.
Shaking the jar in a circular fashion creates a vortex inside the jar.
That is what a tornado is...a vortex.