The three stable (i.e., nonvariable) gases in the atmosphere, in ...

[leilurhhh]

The three stable (i.e., nonvariable) gases in the atmosphere, in order of abundance from most to least, are
 
  A) carbon dioxide, argon, oxygen.
  B) oxygen, carbon dioxide, argon.
  C) nitrogen, oxygen, argon.
  D) oxygen, argon, nitrogen.

Question 2

Dunes are typically classified based on shape.
 
  Indicate whether the statement is true or false

[Brenm]

Answer to Question 1

C

Answer to Question 2

TRUE

[leilurhhh]

TYSM

[Sarahjh]

Thanks for the timely response, appreciate it