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Continental polar
There are 4 types of air masses in North America: maritime tropical, maritime polar, continental tropical, and continental polar. In the continental United States, air masses are moved by the prevailing westerlies and the jet streams.
Continental polar masses are cold and dry air masses because the cold air cannot hold much moisture. As they move into warmer air, they can trigger precipitation.
Continental drift
maritime polar alantic
in the south, tropical air masses would be moving north or upwards. polar air mass would be moving sideways or west.
glaciers
I believe you are asking about Continental drift. See related link.
The North American Interior.
Really move outside their source region
continental polar
Land masses move when their underlying plates move simply because they are resting on top of the plates. This is similar to how if someone is resting on a raft the current of the water will carry them along.