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.

Question

Quizplus · Accepted Answer

Methane concentration is approximately 1.8 parts per million by volume, not 17 ppm. However, this is the closest to being correct among the given options, as the other statements are incorrect.

Which of the Following Statements Concerning the Composition of the Atmosphere