which statement incorrectly describes air masses?

tropical air masses form closer to the equator where the air is warm.
maritime air masses from over water and dry out as they lose water vapor to the water below it.
continental air masses from over dry land and are dry as they travel across the land below.
polar air masses form far from the equator where the air is cold.

maritime air masses form over water and dry out as they lose water vapor to the water below it.