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:      

your answer is b hope that

ń, wǒ shuō yīngyǔ, dàn wǒ huì shuō qítā yǔyán, rú xībānyá yǔ fǎyǔ yìdàlì yǔ hé pǔtōnghuà, suǒyǐ bùyào pànduàn, dànshì