The boundary between a warm air mass moving into a cold air mass ...

[nmorano1]

The boundary between a warm air mass moving into a cold air mass is called a(n)
 
  A) warm front.
  B) cold front.
  C) stationary front.
  D) occluded front.

Question 2

This type of air mass is responsible for much of the precipitation along the coast of western North America: ________.
 
  Fill in the blank(s) with the appropriate word(s).

[Sarahjh]

Answer to Question 1

Answer: A

Answer to Question 2

Answer: maritime polar