Ozone and UV
Name ________________
Part A Open ozonewatch.gsfc.nasa.gov/facts/ozone.html
1. What is ozone ? _________________________________________
2. 90 % of the ozone is in the layer called the ________________________ between ____
_____ km high
3. Naturally Ozone in the stratosphere is created when O2 is _______________________________________________
4. Ozone is destroyed by molecules containing _____________________________
5. Look at the graph - the peak ozone concentration is at about __________ km
6. Stratospheric ozone absorbs _____________ allowing ________ on Earth
7. Review the second graph and complete the table
Wavelength range
8. Gases which have damaged the ozone layer are known as
____________
= ________________________________
9. Where is the troposphere? ___________________________
% Absorption
by atmosphere
UVA
UVB
UVC
and why is ozone bad there?____________________________
Top Right Click on What is a Dobson Unit
10. 300 Dobson units mean that the zone above could be compressed into a layer __________________
11. How does the amount of ozone above the "ozone hole" compare with "normal" areas? _________________________
Top Right What is the Ozone Hole
12. Where is the "Ozone Hole" _____________________ and when does it occur each year ? ________________
13. How does the area of the depleted zone shown for 2004 compare with the area of Antarctica? ________________
14. What property of CFC's allows them to get into the stratosphere? __________________________
15. Which conditions above the Antarctic help the reaction start? ______________________________________
16. Why is the chlorine-ozone reaction called catalytic ? _____________________________________________
Top Right History of the Ozone Hole
17 What was the ozone concentration by the mid 1990's ___________ what % of 1960 level ____________
18. Which chemical was detected where ozone was low? ______________________
Part B Open Wikipedia Ozone Depletion
1. Go down to the 2nd graph (5th image) showing Antarctic Ozone Minimum.
How does 1995-2000 compare with 2000-2005?
_______________________________________
Does the data yet show that the ozone layer is recovering? ______________
2. Go down to Chemicals in the Atmosphere.
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What were CFC's used for ? ______________________________________________________________
3. Go down to Interest in … When was the problem first recognized_____________________________________ 4.
4. Go down to Consequences
Describe 3 problems for humans? ________________________________________
__________________________________________ ________________________________________________________
5. Which other species might be negatively affected ? ______________________________
Down to public policy …..
6. The agreement to phase out CFC's was worked out at _____________________ in ______________________
7. Although this was agreed in the late 1980's recovery is still _________________
8. In the text find the meaning of EECl ______________________________________________________
9. Double click on the graph Which compounds levels have gone up as CFC's declined? ______________
10. The Global total EECl down __________ since __________.
Part C Open
Wikipedia UV index -
1. Why is the UV index so high in the southern hemisphere?
UV Index
___________________________
6-7
Description
2. What maximum levels are common in Australia? ______
3. Go down to the chart and complete the small table
8-10
4. What should you wear if the UV index is over 11?
___________________________________________
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11 and above
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