Although water vapor accounts for about 60 of the atmospheric ...

[kwoodring]

Although water vapor accounts for about 60 of the atmospheric greenhouse effect, it is the increase of ____ in the atmosphere that appears to be the main cause of global warming.
 A) carbon monoxide
  B) ozone
  C) carbon dioxide
  D) argon

Question 2

A tornado cloud that does not touch the ground is called a ____.
 A) funnel cloud
  B) wall cloud
  C) roll cloud
  D) mesocyclone

[pami445]

Answer to Question 1

C

Answer to Question 2

A