Why are tornadoes most common in the so called "tornado alley?"

A. because the air is so warm it can't help but be unstable
B. because it is a place where the air is so dry it becomes unstable
C. because that location is downwind from the Rocky mountains which causes turbulence needed to generate tornadoes
D. because it is a location where air masses with differing temperatures are interacting with each other frequently
E. None of these choices are correct.


Answer: D

Environmental & Atmospheric Sciences

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