The most important process of cloud formation in the atmosphere ...

[maegan_martin]

The most important process of cloud formation in the atmosphere is:
 
  A) cooling by compression of air. B) cooling by expansion of air.
  C) radiation cooling. D) cooling by release of latent heat of vaporization.

Question 2

Water vapor represents what fraction of the air near the earth's surface?
 
  A) 40 - 100 percent
  B) about 20 percent
  C) 0 - 100 percent
  D) about 10 percent
  E) less than 4 percent

[Bigfoot1984]

Answer to Question 1

B

Answer to Question 2

E