Q:
      
      
         
            
Radio waves sent out by a radio stations are reflected by
         
       
      
      
      
          
      
      
          Answer & Explanation
         Answer: D) ionosphere         
         
Explanation: This is a layer of atmosphere about 60 to 70 km above the earth and extends to about 400km. It contains ionised particles which can reflect radio waves making radio communication round the world possible.
       
      
      
      
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