Which of the following is not a kind of air mass found in the united states?
a. polar tropical
c. continental polar
b. maritime polar
d. maritime tropical

A. Polar tropical is NOT a kind of air mass found in the United States.

Explanation:

An air mass is a large volume of air defined by its water vapor content and temperature. The United States are affected by five air masses of air during the course of a year: continental polar, continental tropical, continental artic, maritime tropical and maritime polar. Polar tropical is NOT one the five air masses found in the US.

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