In the Northern Hemisphere, we would expect carbon dioxide ...

[ts19998]

In the Northern Hemisphere, we would expect carbon dioxide concentrations in the atmosphere to dip in the winter.
  Indicate whether the statement is true or false

Question 2

The main reason why moist air is lighter than dry air is that the molecular weight of water is less than that of either molecular nitrogen or molecular oxygen.
  Indicate whether the statement is true or false

[mtmmmmmk]

Answer to Question 1

False

Answer to Question 2

True

[ts19998]

Thanks for the timely response, appreciate it

[tranoy]

Great answer, keep it coming