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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


Od what can be done about it
OD ► What can be done about it?

  • Ban CFCs [worldwide]


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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