The air mass that is the main source of precipitation in the eastern United States is the

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The mT (maritime tropical) air mass is the main source of precipitation in the eastern United States, as it brings warm and moist air from the Gulf of Mexico and Atlantic Ocean. This air mass can produce heavy rain and thunderstorms, particularly in the summer months. Choice A (cP) is a continental polar air mass, which is cold and dry, and does not contribute much to precipitation in the eastern U.S. Choice B (cT) is a continental tropical air mass, which is hot and dry, and also does not contribute much to precipitation in the eastern U.S. Choice D (mP) is a maritime polar air mass, which can sometimes bring rain and snow to the eastern U.S. but is not the main source of precipitation. Choice E (cA) is not a recognized air mass.

The Air Mass That Is the Main Source of Precipitation