Which of the Following Statements Concerning the Composition of the Atmosphere

question 18

Multiple Choice

Which of the following statements concerning the composition of the atmosphere is true?

• A) Water consistently is the gas present in the highest concentrations.
• B) N₂ and O₂ concentrations tend to be variable.
• C) CO₂ is present in the lowest concentration of all gases.
• D) Methane concentration is about 17 parts per million by volume.
• E) Carbon monoxide concentration is 388 parts per million.

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