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Ozone Depletion

Ozone Depletion. What is the ozone layer and where is it found?. The ozone layer is the layer of the atmosphere at an altitude of 15 to 40 km (stratosphere). What is Ozone? Ozone is a molecule made of three oxygen atoms. What is the function of the ozone layer ?

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Ozone Depletion

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  1. Ozone Depletion

  2. What is the ozone layer and where is it found? • The ozone layer is the layer of the atmosphere at an altitude of 15 to 40 km (stratosphere)

  3. What is Ozone? • Ozoneis a molecule made of three oxygen atoms • What is the function of the ozone layer? • ozone absorbs ultraviolet solar radiation.

  4. So…What’s the issue with the ozone layer? • These satellite images below show the growth of the ozone hole (blue, then purple, then red) over the past two decades.

  5. How is ozone depleted?

  6. The chemical reaction that destroys ozone.

  7. Chemical equationfor this process…

  8. How Does the Ozone Hole Form?

  9. If ozone is also being produced as air pollution, why does this ozone not repair the ozone hole in the stratosphere? • Ozone is very chemically reactive. It can chemically burn your lungs (Good up high…bad near by) • Ozone produced by pollution breaks down or combines with other substances in the troposphere long before it can reach the stratosphere to replace ozone that is being destroyed

  10. What are the effects of thinning ozone layer on humans? • As the amount of ozone decreases, more UV light is able to pass through the atmosphere and reach Earth’s surface. • UV light damages DNA • Exposure to UV light makes the body more susceptible to skin cancer, and may cause other damaging effects to the human body.

  11. What have we done to protect the ozone layer?

  12. 2007 was the 20th anniversary of the Montreal Protocol: • "The Montreal Protocol has been a resounding success," said Richard Stolarski, a speaker at the symposium from NASA's Goddard Space Flight Center, Greenbelt, Md. "The effect can be seen in the leveling off of chlorine compounds in the atmosphere and the beginning of their decline." • Since the Montreal Protocol was signed on Sept. 16, 1987, more than 100 nations have agreed to limit the production and release of compounds, notably human-produced chlorofluorocarbons, known as CFCs. CFCs and a list of other compounds are known to degrade the layer of ozone in the stratosphere that shields life from the sun's ultraviolet radiation. That process gives rise to the ozone hole above Antarctica.

  13. Other forms of Pollution…. NOISE!!! • A sound of any kind is called a noise. • Some noises are unnecessary and can cause noise pollution. • Health problems that can be caused by noise pollution include loss of hearing, high blood pressure, and stress. • Noise can also cause loss of sleep, which may lead decreased productivity at work and in the classroom.

  14. Other forms of Pollution…. • LIGHT!!!!! • Light pollution does not present a direct hazard to human health, but it does negatively affect our environment. • The use of inefficient lighting in urban areas is diminishing our view of the night sky. • In urban areas, the sky is often much brighter than the natural sky.

  15. Describe in 1 sentence what is happening in the diagram below. • The hole in the ozone has grown significantly over the past two decades over the continent of antarctica

  16. What causes ozone depletion? • A - Acid Rain • B - Volatile Organic Compounds • C - Chloroflourocarbons • D - Thermal Inversion

  17. What happens to chlorine after it breaks down one molecules of ozone? • A – It move on to break down another molecule of ozone • B – It creates acid rain • C – It destroys aquatic ecosystems • D – It disappears

  18. What does “good up high – bad near by” mean? • Ozone in the stratosphere is helpful because it protects us from harmful UV radiation • Ozone on the ground level is toxic to humans and breaks down before reaching the stratosphere – so it can’t be used to replace the missing ozone

  19. What are some effects on people from ozone depletion? • UV rays can cause genetic damage that can lead to skin cancer or other health problems

  20. What have we done about the hole in the ozone layer? • A - We are moving ground level ozone into the stratosphere • B - CFC’s were no longer produced and later banned from use • C – We are cleaning up the CFC’s from the atmosphere over antarctica • D - Nothing

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