In the large air masses of the Tropics of Capricon and the Tropics of Cancer are where they're formed. You can figure this out from the name. "Maritime" refers to the ocean, and "tropical" refers to the zone around the equator between the Tropics of Capricorn and Cancer. Thus maritime tropical air masses originate over the ocean in the tropics. Similar logic works with the names of other types of air masses as well.
mT formed over tropical waters
Over the sea.
they form over bodies of water
in the sea
Warm, humid
Both originate over land and are generally dry.
polar continental air mass
A maritime polar air mass is characterized as a cold and moist air mass.
a maritime polar air mass is an air mass with cool and moist conditions. they form in the northern areas of the atlantic and pacific ocean.
high-pressure belts
Maritime (marine for humid) Polar (cold/cool)
Both originate over land and are generally dry.
A maritime polar air mass is characterized as a cold and moist air mass.
polar continental air mass
There are cold and dry air that exists in a continental polar air mass
A maritime polar air mass is characterized as a cold and moist air mass.
a maritime polar air mass is an air mass with cool and moist conditions. they form in the northern areas of the atlantic and pacific ocean.
cold and moist air mass comes from polar ocean areas
A maritime polar air mass is a mass of air, very much like that of continental polar air, that has passed over warm water (such as an ocean) thus rendering it unstable.
high-pressure belts
Pay close attention to your question. A maritime (meaning oceanic) air mass has moisture, therefore it's not dry. Polar (meaning from the polar region) air mass is cold, therefore it is cold. Hence a maritime polar air mass would be moist and cold...how hard was that?
A continental polar air mass forms over land in northern Canada. A continental polar air mass forms inland from the oceans of Northern Russia, Siberia and Northern Canada.