Question

fill in the blank question
the origins of maritime tropical air masses are tropical bodies of
the southwestern united states and
are source regions of continental tropical air masses.
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Explanation:

Maritime tropical air masses form over warm ocean waters, so they originate from tropical bodies of water. Continental tropical air masses are dry and hot, with source regions like the southwestern United States and northern Mexico (a common arid/semi-arid continental tropical source).

Answer:

water
northern Mexico