Lesson 4: Ozone Depletion ***608 CFC***STUDY GUIDE.

Lesson 4: Ozone Depletion ***608 CFC***STUDY GUIDE.What is the strongest evidence that CFCs are in the stratosphere? - ANSWERMeasurement of CFCs in air samples from the stratosphere Under the "safe disposal requirements," who is responsible for ensuring that refrigerant has been removed from household refrigerators before they are disposed of? - ANSWERThe final person in the disposal chain Which type of refrigerant is the most harmful to stratospheric ozone? - ANSWERCFC Chlorine in the stratosphere is believed to come primarily from CFC's rather than from natural sources such as volcanoes because: - ANSWERThe rise in the amount of chlorine measured in the stratosphere over the last twenty years matches the amount of fluorine, which has different natural sources than chlorine, over the same period The rise in the amount of chlorine measured in the stratosphere over the last twenty years matches the rise in CFC emissions over the same period Samples of air taken from the stratosphere over erupting volcanoes show that volcanoes contribute only a small quantity of chlorine to the stratosphere compared to CFCs All of the above The molecule found in CFC and HCFC refrigerants that destroys ozone in the stratosphere is: - ANSWERChlorine The gas in the stratosphere that protects us from ultraviolet radiation is: - ANSWEROzone Which refrigerant contains no chlorine? - ANSWERR-134a What effects can ozone depletion have on the environment? - ANSWERReduced crop yields Reduced marine life Increased ground-level ozone