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Ozone Depletion & Water Pollution. Unit 7-1 Notes Mr. Hefti – Pulaski Biology. Ozone Depletion ► What is it?. Thinning of ozone layer Shield of gases 20-50 km above Earth’s surface that absorb UV radiation from sunlight. OD ► What causes it?.

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ozone depletion water pollution

Ozone Depletion & Water Pollution

Unit 7-1 Notes

Mr. Hefti – Pulaski Biology

ozone depletion what is it
Ozone Depletion ►What is it?
  • Thinning of ozone layer
  • Shield of gases 20-50 km above Earth’s surface that absorb UV radiation from sunlight
od what causes it
OD ►What causes it?
  • CFCs (chlorofluorocarbons) break apart ozone molecules
  • CFCs were formerly used to make:
    • Foam
    • Coolants
    • Propellants for aerosol cans
od why is it bad
OD ► Why is it bad?
  • UV exposure causes:
    • Sunburns
    • Skin cancer
    • Damage to eyes
    • Disrupted growth patterns of producers in food webs
    • Genetic mutations
water pollution what is it
Water Pollution ► What is it?
  • Contamination to:
    • Streams
    • Lakes
    • Underground water (aquifers)
    • Bays
    • Oceans
  • All organisms require water
wp what causes it
WP ► What causes it?
  • Major water pollutant categories:
    • Chemical
    • Biological
    • Physical materials
    • Thermal
wp why is it bad
WP ► Why is it bad?
  • Survival impossible in presence of toxic chemicals or harmful microorganisms
  • Polluted water causes people to become ill or develop defects
wp what can be done about it
WP ► What can be done about it?
  • Clean Water Act (1972) – outstanding legislation
  • Sewage treatment
  • Discourage careless dumping through fines
  • Limit erosion
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