Name the polar and tropical air masses that affect U. S. weather. Describe the pattern of movement across the continent and patterns of precipitation associated with warm and cold fronts.

The answer to this question can be defined as follows:

Explanation:

In the cold surface, the air is defined by polar weather systems and relatively warm surface air masses. Its masses throughout the polar vortex are very cold.  

and the 5 air masses, that impact the United States in such a normal year: continental polar, Continental Arctic, continental tropical, marine polar, maritime tropic. It influences the 5 Coastal in the USA for the continental plates, and the pattern of movement can be defined as follows:      

chinese civil war took place over a long period of time between 1927 and 1950. the war was interrupted when japan invaded china in 1936 and by world war ii. the war was fought between the nationalist government of china, also called the kuomintang (kmt), and the communist party of china (cpc).