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Author Question: In addition to carbon dioxide, _______________ and _______________ have risen above their ... (Read 66 times)

tingc95

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on: Jul 13, 2018
In addition to carbon dioxide, _______________ and _______________ have risen above their pre-industrial levels in Earths atmosphere.
   
  Fill in the blank with correct word.

Question 2

Earth has experienced _______________ ice ages over the past two million years.
   
  Fill in the blank with correct word.


tranoy

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Reply #1 on: Jul 13, 2018
Answer to Question 1

ANSWER: methane, nitrogen oxides

Answer to Question 2

ANSWER: 20, twenty


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