sc 9 unit c -2.3 student notes-filled...
Transcript of sc 9 unit c -2.3 student notes-filled...
sc 9 unit c 2.3 student notesfilled in.notebook
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Section 2.3 Monitoring The Atmosphere (p 229 232)Chemicals in the Earth's atmosphere can affect the entire globe. The two most pressing issues are __________________ and __________________.A. Carbon Dioxide as a Greenhouse Gas:Life on Earth exists because we live in a natural greenhouse which traps the Sun's _______.
(p 229)
There are several greenhouse gases: ___________________ ___________________ ___________________ ___________________
___________ GREENHOUSE EFFECT: higher than normal amounts of carbon dioxide (due to clearing land and also
burning fossil fuels) More heat is trapped leading to ____________________
Some Natural causes of global warming: volcanic eruptions forest fires
Problems associated with global warming: more ______________ _________ coastal areas from melting ice caps ________ __________ in the spread of disease
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What can countries do to reduce the Enhanced Greenhouse Effect?
____________ CO2 emissions (by using wind farms & hydropower) grow more _________ to absorb CO2 Trap CO2 ________________
B. The Ozone ( ) Layer ( p 232)
15 to 50 km above the Earth's surface _________ the Earth from damaging ___ rays.monitored since late 1970's '_______' are very thin areas
NOTE: the ozone layer is thinnest over the _______ ________ where ice particles in the upper atmosphere speed up the ozone depleting reactions.
main cause of ozone depletion is ______'s (chlorofluorocarbons)Sources of CFC's:
How is the ozone being destroyed?
UV light ________ CFC's into free ________ chlorine breaks the ozone (O3) into oxygen gas (O2) 1 chlorine atom can destroy ___________ ozone molecules
Problems With Low Atmospheric Ozone:
more ____ light hits the Earth causing: more cases of ___________ & ____ ____________ death of ___________(beginning of aquatic food chains)
Antarctica
Presently many countries have signed agreements to reduce use of CFC's
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Questions Section 2.3 1. List four greenhouse gases:
2. a) What trend has been observed in carbon dioxide levels over the past 100 years? ________________ b) Suggest two causes of this trend.
3. What is the difference between the greenhouse effect and the enhanced greenhouse effect?
4. What are three effects of global warming?
4. a) What factor has contributed to the thinning of the ozone layer?
b) What problems are associated with the thinning of the ozone layer?
5. What are countries doing to protect the ozone layer?
CHAPTER 2 REVIEW
1. What do the presence of fish and a wide diversity of invertebrates in a river indicate?
2. Why is it important to have longterm measurements when studying ecosystems?
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3. a) Name 4 heavy metals which can get into our water system or be taken up by plants:
b) Why are they considered to be pollutants?
4. Use the data from two water systems to answer the following questionCharacteristic Sample
A Sample B
pH 6.5 5.5
dissolved O2 5.5 4.5
phosphorus low high
nitrogen low high
mayflies present absent Which statement is correct?a. A has good water quality for aquatic life because there are low concentrations of fertilizer b. A indicates poor water quality for aquatic life because there are many mayfliesc. B has good water quality because the pH is neutrald. B indicates good water quality because the pH is basic and mayflies are absent.
5. You have an air sample that has 0.02 ml of carbon dioxide in 1000 ml of air. What is the concentration in parts per million (ppm)?
7. Matching___ 1. LD50 a. chemical used to kill insects___ 2. neutralize b. to bring closer to pH 7___ 3. insecticide c. caused by burning fossil fuels___ 4. scrubber d. used to compare toxicity___ 5. spring acid shock e. removes SO2 (g) from industrial emissions___ 6. global warming f. caused by CFC's___ 7. ozone holes g. sudden lowering of pH
8. Explain how the enhanced greenhouse effect may cause global warming.
9. How does reforestation affect the concentration of carbon dioxide in the air?
6. Describe two situations that would reduce the amount of dissolved oxygen in water: