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      Question

      Identify the gas that is not considered a permanent part

      of the Earth's atmosphere.
      A Neon Correct Answer Incorrect Answer
      B Helium Correct Answer Incorrect Answer
      C Xenon Correct Answer Incorrect Answer
      D Methane Correct Answer Incorrect Answer

      Solution

      Methane, unlike Neon, Helium, and Xenon, is not a permanent component of the atmosphere due to its variable concentrations influenced by biological and geological processes.

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