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Ninth Grade (Grade 9) Biotic and Abiotic Questions

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Grade 9 Biotic and Abiotic
What ozone-depleting substance has NOT been phased out in developing and developed countries?
  1. bromochloromethane (BCM)
  2. chlorofluorocarbons (CFCs )
  3. hydrobromofluorocarbons (HBFCs)
  4. hydrochlorofluorocarbons (HCFCs)
Grade 9 Biotic and Abiotic
Grade 9 Biotic and Abiotic
The thickness of the ozone layer is measured using
  1. centimeters.
  2. Dobson units.
  3. millimeters.
  4. ozone units.
Grade 9 Biotic and Abiotic
Grade 9 Biotic and Abiotic
Grade 9 Biotic and Abiotic
Grade 9 Biotic and Abiotic
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