The Marine Tropical air mass is best described as which?

• A. Cold and dry
• B. Warm and moist
• C. Cool and windy
• D. Dry and cool

Answer: (B)

Air masses reflect the properties of their source regions, especially temperature and moisture. A marine tropical air mass forms over warm tropical oceans, picking up heat from the sea and a lot of moisture from the water. That combination—warm temperature and high humidity—makes it best described as warm and moist. The other options describe air masses from different sources (cold or dry land, cooler regions, or dry air), which don’t match the marine tropical characteristics.