A type of air mass which forms over warm water is called: C. maritime tropical.
An occluded front can be defined as a composite weather front that is specifically formed during cyclogenesis, and it eventually causes a cold front to overtake a warm front or formed over warm water and thereby, forcing it aloft with respect to surrounding air masses.
This ultimately implies that, a maritime tropical is a terminology that is used to describe a type of air mass which forms over warm water.
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