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In the Great Plains of the U.S., tornadoes are common in the summer. This is because _____.

continental polar air masses can reach further south
tornadoes get their energy from flat ground
winters are more humid than summers
winds pick up speed more gradually in the summer

Answer :

antonsandiego
I'm 100% sure, that in the Great Plains of the U.S., tornadoes are common in the summer. This is because winds pick up speed more gradually in the summer. 

I believe the answer is: winds pick up speed more gradually in the summer

The increase of wind speed is related to the temperature. Temperature could influence the motion of the atoms , and the motion tend to be faster in higher temperature. Due to his increase in motion, winds pick up speed more gradually at summer and increase the likelihood of tornadoes from occuring.

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