ECOLOGY
CHEMICAL CYCLES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Increased runoff of pesticides into lakes and rivers
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Increase levels of atmospheric nitrogen
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Depletion of the ozone layer resulting in higher levels of UV radiation
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Decreased levels of atmospheric oxygen
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Detailed explanation-1: -Ozone layer depletion increases the amount of ultraviolet (UV) irradiation that reaches Earth’s surface; this can increase the risk of skin cancer, particularly at higher latitudes. The global shift away from ozone-depleting substances has also had co-benefits on the reduction of greenhouse gas emissions.
Detailed explanation-2: -Ozone layer depletion increases the amount of UVB that reaches the Earth’s surface. Laboratory and epidemiological studies demonstrate that UVB causes non-melanoma skin cancer and plays a major role in malignant melanoma development.
Detailed explanation-3: -Gaseous CFCs can deplete the ozone layer when they slowly rise into the stratosphere, are broken down by strong ultraviolet radiation, release chlorine atoms, and then react with ozone molecules. See Ozone Depleting Substance.)
Detailed explanation-4: -Molina discovered that chlorofluorocarbons (CFCs) could deplete Earth’s atmospheric ozone layer, which blocks the sun’s damaging ultraviolet rays.
Detailed explanation-5: -Chlorofluorocarbons (CFCs) cause significantly stratospheric ozone depletion and global warming relating to the greenhouse effect.