Which air masses influence much of the weather in north america, especially east of the rocky mountains? a. maritime tropical and continental polar b. maritime polar and continental polar c. continental polar and continental tropical d. maritime pola?

There are 4 types of the air masses that influence the weather in North America: Continental Polar, Continental Tropical, Maritime Polar and Maritime Tropical.
Continental Polar and Maritime Tropical influence the weather in North America most especially east of the Rocky Mountains.

A. Maritime Tropical and Continental Polar 

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