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Question 1 of 40All of the following have been linked to damage caused by UVB radiation EXCEPT:A. destruction of DNA. B. melanoma and premature aging. C. basal cell and squamous cell carcinomas. D. severe sunburn.Question 2 of 40Which of the following is a biotic as opposed to an abiotic factor in an ecological system?Question 3 of 40The foremost emitters of methane, a greenhouse gas, are:Question 4 of 40As demonstrated by the Keeling curve, carbon dioxide concentration in the atmosphere was expected to reach __________ ppm by 2010. But, in fact, carbon concentration exceeded that level in 2013 and is still rising.
Question 5 of 40Which of these planets is in the so-called “Goldilocks Zone”?A. Earth B. Mars C. Jupiter D. VenusQuestion 6 of 40When carbon dioxide is dissolved in water it produces __________ acid.Question 7 of 40Discussing causes of desertification in semi-arid locales, Allen maintains that overcultivation of soils depletes them of vital nutrients. Audrey argues that stripping away vegetation through overgrazing leadsto soil erosion and deforestation. Who is correct?Question 8 of 40According to the EPA, the second most significant factor in human-caused global warming and climate change is:
Question 9 of 40Chlorofluorocarbons (CFCs), the main culprit in the depletion of atmospheric ozone, are being replaced with hydrofluorocarbons (HFCs), thus greatly reducing ozone layer depletion. What is the only drawback to this strategy?A. HFCs give off an unpleasant odor. B. HFCs are potent greenhouse gases. C. HFCs are more expensive to produce than CFCs. D. HFCs are toxic to wildlife.