Over the past approximately 100 years, it appears that average ...

[jenna1]

Over the past approximately 100 years, it appears that average global temperatures have ____.
 A) increased slightly
  B) fluctuated widely but shown no overall change
  C) decreased slightly
  D) remained constant

Question 2

The atmospheric greenhouse effect is due primarily to the fact that ___.
 A) oxygen and ozone absorb ultraviolet radiation
  B) nitrogen and oxygen transmit visible radiation
  C) cloud formation releases latent heat energy
  D) carbon dioxide and water vapor absorb infrared radiation

[cegalasso]

Answer to Question 1

A

Answer to Question 2

D