permission slip? please get out objectives #21-23 for a stamp please read the board! woot!
TRANSCRIPT
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Permission slip? Please get out objectives #21-23 for a stampPlease read the board!
Woot!
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•pathogens
•oxygen demanding wastes
•organic and inorganic chemicals
•sediment
•Plant nutrients
•Heat /thermal pollution
Types & Sources of Water PollutionTypes & Sources of Water Pollution
© Brooks/Cole Publishing Company / ITP
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What do these have in common?•oxygen demanding wastes
•sediment
•Plant nutrients
Heat /thermal pollution
They reduce the amount of oxygen available in the water!
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Dissolved oxygen (DO)
Aquatic organisms need it to do cellular respiration
C6H12O6 + O2 ATP + CO2 + H20
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How does DO get into water? Photosynthesis Physical churning diffusion
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Testing for Dissolved Oxygen
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LAB TOMORROW!Where is there better water quality – upstream on Buffalo Bayou or downstream?
DOTemperatureTurbiditypHPhosphatesNitrates
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What lowers DO?
•oxygen demanding wastes (leaves, sewage, manure decompose in water. Decomposers use up the DO)
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What lowers DO?
Sediment (soil blocks sunlight – plants can’t do photosynthesis)
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What lowers DO?
Heat /thermal pollution Warm water holds less oxygen
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What lowers DO?
Plant nutrients (eutrophication)
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BRAINSTORM GAME – 1MINUTE
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Eutrophication Obj #27
Each pair/tri needs a white board, 2 markers, and an eraser – send a runner now!
Page 137 Read the paragraph on artificial eutrophication.
List the steps of eutrophication on obj #27.
Compare your list with your neighbors Use your notes to draw a cartoon of the
process on the white boards.
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Plant nutrients (nitrogen and phosphorus) cause eutrophication
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Other sources of plant nutrients Untreated sewage Manure from livestock Pet wastes Leaking septic systems
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Carry water from streets to local bayou/water way
ONLY WATER should go down these!
NO:◦ Litter◦ Leaves◦ Pet poop◦ Oil/paint
Storm drains
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What’s the difference between storm drains and the drains in your home?
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Hypoxic zones “Dead zones” – form in the summer Gulf of Mexico
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Eutrophication
Which pollutants are involved? What are the sources of these pollutants? Are these sources point or nonpoint
sources? What are the effects of eutrophication? Why does the dead zone form in the Gulf
near New Orleans? Why does the dead zone form in the
summer?