The atmosphere: A) has vertical wind speeds that are typically ...

[maegan_martin]

The atmosphere:
 
  A) has vertical wind speeds that are typically around one-tenth that of horizontal wind speeds.
  B) is about as deep as the planet is wide.
  C) is more than 99 percent contained within the first 60 miles from the earth's surface.
  D) has not changed substantially in composition since the earth formed over four billion years ago.

Question 2

This is the most abundant gas in the atmosphere:
 
  A) nitrogen.
  B) oxygen.
  C) carbon dioxide.
  D) water vapor.

[ghepp]

Answer to Question 1

Answer: C

Answer to Question 2

Answer: A