John J. McCarthy Observatory, New Milford, CT. Monthly astronomy lecture done by Bob Lambert. Date of this lecture is October 2008.  Video starts with a discussion of where the first atmosphere came from.  Then progresses into how long the primary atmosphere lasted and what happened next.  Presenter shows pictures of early constant eruption of volcanoes and bombardments of comets.  Further discusses the CO₂ cycle, the emergence of nitrogen, and the emergence of oxygen.  Presenter stands beside a screen that is a Power Point presentation.  Video is of good quality and would be appropriate for late elementary students through high school students. Run time 10:00.