To be distinguishable, an air mass must meet three requirements: ...

[genevieve1028]

To be distinguishable, an air mass must meet three requirements:
  1 . It must be large. A typical air mass is more than 1600 kilometers (1000 miles) across and several kilometers deep.
  2 . It must have uniform properties in the horizontal dimension. This means that at any given altitude in the mass, its physical characteristicsprim arily temperature, humidity, and stabilityare relatively homogeneous
 
  3 . It must be a recognizable entity and travel as one. Thus, it must be distinct from the surrounding air, and when it moves, it must retain its original characteristics and not be torn apart by differences in airflow.
 
  The purpose of the paragraph is
 
  a. to inform the reader that the major characteristic of an air mass is its size.
  b. to analyze how an air mass avoids being torn apart by differences in airflow.
  c. to describe the characteristics an air mass must have and retain, in order to be distinguishable.
 
  The tone of the paragraph is
  a. skeptical. b. descriptive. c. pessimistic.

Question 2

As much as any one thing, John F. Kennedy seemed to inspire a sense of youth, hope,
  and optimism in his fellow countrymen it was a little known fact that he struggled
  with several life-threatening conditions of his own.
 
  A. Complete sentence
  B. Comma splice
  C. Run-on

[Anton]

Answer to Question 1

c. b

Answer to Question 2

C

[genevieve1028]

TYSM

[AmberC1996]

Excellent