Is both our planets thermostat and the worlds chief

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Social impact of technology - lesson 5 answers

Question 12   of 40 5.0 / 5.0 Points Phytoplankton , aside from being the base of the oceanic food chain , produce __________ percent of our planet ’s atmospheric oxygen .
A. 20
B. 30
C. 40
D. 50
Answer:  D.   50
Question 13   of 40 5.0 / 5.0 Points As 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 .
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Question 14   of 40 5.0 / 5.0 Points Ecologists who study the way many species interact with each other in a specified area are focused on :
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Question 15   of 40 5.0 / 5.0 Points When ecologists are examining , for example , the ways that energy is distributed over a food chain or the rate at which nutrients are recycled , they are engaged in __________ in order to understand how the whole system works .
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Question 16   of 40 5.0 / 5.0 Points Chlorofluorocarbons ( 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 .
Answer:  B.   HFCs are potent greenhouse gases .
Question 17   of 40 5.0 / 5.0 Points Discussing 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 leads to soil erosion and deforestation . Who is correct ?
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Question 18   of 40 5.0 / 5.0 Points Disruption of the _ _________ cycle will lead to unpredictable impacts on human well - being because of this cycle ’s vital role in regulating global climate patterns .
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Question 19   of 40 5.0 / 5.0 Points Extinctions are not rare . Over an extended period of time , based for example on fossil evidence , a certain number of species will become extinct each year . Thus , experts can estimate a background rate of species extinction . Using that estimate , researchers can compare it to the current extinction rate over , for example , the last two decades . What they have found is startling . According to cautious estimates , the current extinction rate is __________ times greater than the background rate .
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Question 20   of 40 5.0 / 5.0 Points As the Arctic permafrost melts , the proportion of __________ to all the other greenhouse gases is rising . That ’s significant since , among all greenhouse gases , that gas is eight times more potent than carbon dioxide .
A. nitrous oxides
B. methane
C. water vapor
Answer:  B.   methane
__________ is both our planet’s thermostat and the world’s chief greenhouse gas. A. Water vapor B. The sum of all atmospheric pollutants C. Carbon dioxide D. Ozone
Question 12 of 40 5.0/ 5.0 Points Phytoplankton, aside from being the base of the oceanic food chain, produce __________ percent of our planet’s atmospheric oxygen.
Question 13 of 40 5.0/ 5.0 Points As 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 14 of 40 5.0/ 5.0 Points Ecologists who study the way many species interact with each other in a specified area are focused on:
C. niches. D. biomes. Question 15 of 40 5.0/ 5.0 Points When ecologists are examining, for example, the ways that energy is distributed over a food chain or the rate at which nutrients are recycled, they are engaged in __________ in order to understand how the whole system works. A. habitat ecology B. systemic analysis C. ecosystem ecology D. biosphere studies.
Question 16 of 40 5.0/ 5.0 Points Chlorofluorocarbons (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?
Question 17 of 40 5.0/ 5.0 Points Discussing 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 leads to soil erosion and deforestation. Who is correct?
D. Only Audrey is correct. Question 18 of 40 5.0/ 5.0 Points Disruption of the __________ cycle will lead to unpredictable impacts on human well-being because of this cycle’s vital role in regulating global climate patterns.

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