The most abundant greenhouse gas in Earth's current atmosphere is ...

[fox]

The most abundant greenhouse gas in Earth's current atmosphere is
   a. carbon dioxide (CO2).
   b. nitrous oxide (N2O).
   c. water vapor (H2O).
   d. methane (CH4).
   e. chlorofluorocarbons (CFCs).

Question 2

The only substance near Earth's surface that is found naturally in the current atmosphere as a solid, liquid, and a gas is
   a. carbon dioxide.
   b. water.
   c. molecular oxygen.
   d. ozone.
   e. carbon.

[britb2u]

Answer to Question 1

ANSWER: c

Answer to Question 2

ANSWER: b

[fox]

Thank you

[britb2u]

No problemo