What type of air mass is formed over subtropical waters?

Maritime tropical air masses are formed over subtropical waters, characterized by their warm and humid conditions. These air masses originate in the oceans and carry moisture into the atmosphere, which ultimately influences weather patterns when they move over land. The warmth of the subtropical waters contributes to their overall temperature and humidity, making them significant contributors to precipitation in regions they move into, often leading to conditions favorable for thunderstorms and other weather events.

The maritime aspect emphasizes the moisture component due to the air mass being over water, while the tropical classification denotes the warm temperatures associated with these regions. This is why the maritime tropical air mass is the correct choice, as it accurately reflects the characteristics of air that forms over these subtropical marine areas, affecting the climate and weather of adjacent land areas.