Final answer:
The air mass over Nashville, TN is typically Continental Polar (cP) in the winter, cold and dry, or Continental Tropical (cT) in the summer, warm and dry, varying with weather patterns and season.
Step-by-step explanation:
The type of air mass that typically forms over Nashville, TN, would be characteristic of the continental United States interior and Southeast regions. Such air masses are generally classified as Continental Polar (cP) during the winter, which are cold and dry, or Continental Tropical (cT) during the summer, which are warm and dry. The specific air mass can vary depending on the prevailing weather patterns, the season, and the movement of air masses from other regions.