In 1985, a researcher in Antarctica noticed that ozone levels in the atmosphere seemed to be as much as 35 percent lower than the average values during the 1960s. Satellite images taken over the South Pole revealed that the ozone concentration was unexpectedly lower over Antarctica than elsewhere in the Earth’s atmosphere. It was as if an “ozone eater” were causing a mysterious zone of below-normal concentration, an area that researchers called the ozone hole. Which human activities are thought to be responsible for creating this ozone hole in the upper atmosphere? (SC.912.L.17.20)

Question

In 1985, a researcher in Antarctica noticed that ozone levels in the atmosphere seemed to be as much as 35 percent lower than the average values during the 1960s. Satellite images taken over the South Pole revealed that the ozone concentration was unexpectedly lower over Antarctica than elsewhere in the Earth’s atmosphere. It was as if an “ozone eater” were causing a mysterious zone of below-normal concentration, an area that researchers called the ozone hole. Which human activities are thought to be responsible for creating this ozone hole in the upper atmosphere? (SC.912.L.17.20)

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1 point
a. increasing the human population and cutting down forests
b. burning fossil fuels and the related increase in atmospheric CO2
c. burning sulfur-rich coal and increasing levels of greenhouse gases
d. producing and releasing chemicals called chlorofluorocarbons (CFCs)

Answer 1