D All of these are true. A Sulphur b Chlorine c Sulphur dioxide d Nitrogen dioxide 8. Know Your Ozone It S Good Bad And Bacteria Blasting American Council On Science And Health Ozone Depletion Ozone Layer Ozone Which of the following is true of the ionosphere. . C It determines the intensity of sound and sound pollution. With reference to effect of green house gases which of the following isare true. Chlorofluorocarbons CFCs are synthetic chemicals that find a variety of important applications. Click here for the answer. 2 CFCs first got their start in the early 1930s when new innovations such as the refrigerator and air conditioning were beginning to be introduced into homes and businesses throughout the world. C They are used to make foam products. Which of the following statements concerning chlorofluorocarbon CFC is FALSE. Commonly known by the name Freon. I only 8Blue skies occur during the day due to...