Nobody knows. Many tornadoes occur every year but they cannot be predicted.
No, it is not possible to stop a tornado with another tornado. Tornadoes are formed by specific weather conditions in the atmosphere, and introducing another tornado would not have any effect on the existing tornado.
Another name for a tornado is a twister.
Tornado
Yes. On rare occasions tornadoes have been known to merge with one another.
Yes. In some cases a large, strong tornado will produce what is called a satellite tornado, which circles the main one.
No. Twister is just another word for a tornado.
Yes, in some instances one tornado may spawn a smaller satellite tornado.
Whirlwind?
Tornado
No. Tennessee is east of Tornado Alley. Some put it in another tornado forming region called "Dixie Alley."
Yes, and if the same storm it may be minutes apart.
Not necessarily. Higher temperatures do increase the chance of a stronger tornado forming, but not necessarily. Scientists still don't really understand why one storm produces a tornado while another doesn't or why one tornado is stronger than another.