What is an air mass that forms over the ocean near the equator

Explanation:

The word that describes humidity (maritime or continental) is paired with the word that describes temperature (equatorial, tropical, polar or arctic). For example, if an air mass forms over a tropical ocean, it is called maritime tropical. If an air mass forms over land in the far north it is called continental polar.

not completely sure but i think it’s many moons, smaller in size and a ring system.

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