How to make a tornado

It has been so much fun at Enrich so far. I can make a tornado out of  two big plastic bottles. You fill it one bottle with water and glitter. Next you put the other bottle on the top of the filled bottle and tape it together.  Next. you have to turn it upside down quickly, and swirled it.  The water from the top, drains to the bottom like a tornado.  The water moving downwards, is like the cold air inside a real tornado.  The air from the empty bottle, moves up to the top bottle just like the hot air moves upwards in a real tornado.  Katie asked up to find out what a vortex is.  It can be fast, spinning air or water (fluid).