Review and Unit Quiz

Main Points

  • The major components of the atmosphere exists in amounts which are reasonable stable over time.
  • Trace elements are less stable, and have amounts which vary over time.
  • Water vapor is the most abundant of the variable gases, ranging from 0% to 4% by volume.

Unit Quiz: You will now be presented with a five-question, multiple-choice quiz. You should score at least four (4) out of five (5) on this end-of-unit quiz before continuing to the next unit. Once you have completed the quiz, close the quiz window, and continue to the next unit
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