Average global temperatures from thousands of years ago can be ...

[Capo]

Average global temperatures from thousands of years ago can be determined by measuring which of the following from a glacial ice core?
 
  A) The half-life of radioactive water.
  B) The size of ice crystals.
  C) The ratio of deuterium to hydrogen.
  D) The percentage of atmospheric nitrogen.

Question 2

Ideally, if the rate at which humans produced carbon dioxide were to hold steady, then the amount of carbon dioxide in the atmosphere would ________.
 
  A) continue to increase
  B) also hold steady
  C) begin to decrease
  D) none of the above

[katara]

Answer to Question 1

C

Answer to Question 2

A

[Capo]

Gracias!

[adammoses97]

Thanks for the timely response, appreciate it