Air masses have both horizontal and vertical extent; ...

[jazziefee]

Air masses have both horizontal and vertical extent; consequently, the upward extension of a front is referred to as a(n) ___________________ _ or ___________________ _.
  Fill in the blank with correct word

Question 2

Air masses are grouped into five general categories according to their ___________________ _.
  Fill in the blank with correct word.

[heyhey123]

Answer to Question 1

ANSWER: frontal surface; frontal zone
frontal zone; frontal surface

Answer to Question 2

ANSWER: source region