Which statement best describes a characteristic of maritime polar air masses?

they occur mostly during the summer.
they form over water with cool, moist air.
they bring dense, heavy snow in the winter.
they have cool, dry air that forms over land.

Hi,

They form over water with cool, moist air

Explanation:

Maritime polar air masses originate are formed over cold ocean currents.This air mass has less moisture content compared to maritime tropical air masses which are warm and moist.Maritime polar air masses can bring rain and snow to cover a very large area. This air mass can produce fog and a cloudy weather.The Pacific North west experiences this air mass regularly.

Best of Luck!