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    Physical Geography Study Set 2
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    Exam 10: Climate Change
  5. Question
    <B>Concentrations of Methane Gas Since 1985</B>
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Concentrations of Methane Gas Since 1985

Question 73

Question 73

Multiple Choice

 Concentrations of methane gas since 1985  Present atmospheric methane (CH<sub>4</sub>) concentrations are at approximately_ ppb. A) 250 B) 750 C) 1000 D) 1500 E) 1800 Concentrations of methane gas since 1985

Present atmospheric methane (CH4) concentrations are at approximately_ ppb.


A) 250
B) 750
C) 1000
D) 1500
E) 1800

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