In this image Earth’s surface the temperature averages about 15°C However as I journey higher into the atmosphere it gets colder and colder. At about 30,000 feet up I hit another layer of warmed air! I investigate the phenomenon close up and find 90% of the world’s ozone molecules are found here.  

 JOURNEY Index    Look back to 1                                           Journey on to 3 

 Chapter Three - A Holey Pilgrimage-Oh, Holey Ozone Layer

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