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Ozone depletion: Quiz


Question 1: These elements are found in certain stable organic compounds, especially ________ (CFCs), which may find their way to the stratosphere without being destroyed in the troposphere due to their low reactivity.
Carbon tetrachlorideChloroformChlorofluorocarbonHalomethane

Question 2: At this time, ozone at ground level is produced mainly by the action of UV radiation on ________ gases from vehicle exhausts.
OxygenFireCombustionInternal combustion engine

Question 3: Results from the ________'s Geophysical Fluid Dynamics Laboratory show that above 20 km (12.4 miles), the greenhouse gases dominate the cooling.
United States Environmental Protection AgencyNational Agricultural Statistics ServiceNational Oceanic and Atmospheric AdministrationNational Weather Service

Question 4: [1] The main source of these halogen atoms in the stratosphere is photodissociation of ________ (CFC) compounds, commonly called freons, and of bromofluorocarbon compounds known as halons.
HalomethaneChloroformChlorofluorocarbonCarbon tetrachloride

Question 5: Standard ________ theory predicts that the stratosphere will cool.
Global warming controversyScientific opinion on climate changeGlobal warmingKyoto Protocol

Question 6: What does the following picture show?

  Lowest value of ozone measured by TOMS each year in the ozone hole.
  The ozone cycle
  Ozone hole in North America during 1984 (abnormally warm reducing ozone depletion) and 1997 (abnormally cold resulting in increased seasonal depletion). Source: NASA[18]
  Layers of the atmosphere (not to scale)

Question 7: What does the following picture show?

  Image of the largest Antarctic ozone hole ever recorded (September 2006).
  Ozone-depleting gas trends.
  NASA projections of stratospheric ozone concentrations if chlorofluorocarbons had not been banned.
  The ozone cycle

Question 8: What does the following picture show?

  Radiative forcing from various greenhouse gases and other sources.
  Layers of the atmosphere (not to scale)
  Radiative forcing from various greenhouse gases and other sources.

Question 9: To some extent, CFCs have been replaced by the less damaging hydro-chloro-fluoro-carbons (________), although concerns remain regarding HCFCs also.
ChloroformHalomethaneChlorofluorocarbonCarbon tetrachloride

Question 10: ('h' is Planck's constant, 'ν' is frequency of ________)
Maxwell's equationsElectromagnetic radiationElectromagnetismClassical electromagnetism


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