EESA11 Lec 8 Possible questions

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Published on 16 Apr 2013
School
UTSC
Department
Environmental Science
Course
EESA11H3
EESA11 Lec 8 Possible questions
1. What causes the hypoxia problems in the Gulf of Mexico?
a. Hypoxia results from the stratification of marine waters due to Mississippi River
System freshwater inflow and the decomposition of organic matter stimulated by
Mississippi River nutrients
2. *** (KNOW) Provide the series of cause-effect relationships that result in fish kills in the
Neuse River Estuary
a. Sediment oxygen demand frequency of hypoxia duration of stratification
b. Frequency of hypoxia fish health number of fish kills
number of fish kills
shellfish abundance
OR
3. What causes the high hydrogen sulfide concentrations in the Black Sea?
a. The Black Sea is virtually dead below a depth of about 170 m. the metabolism of
some bacteria generates hydrogen sulfide and it is present in the entire lower layer
of seawater in the Black Sea
4. What is so special with the Lake Washington restoration story
a. Between 1941-1963, the lake received increasing amounts of secondary treated
sewage which resulted in eutrophication and declined water quality of the lake.
Planktonic algae was dominated by blue-green bacteria from 1955-1973. Water
quality improvements followed and blue-green algae decreased and have been
insignificant since 1976
b. Dr. Edmonson found that phosphorus from sewage was fertilizing algae in Lake
Washington
5. What was the cause for the suffocation of 1800 people in Lake Nyos?
a. The lake emitted a large cloud of CO2 in a limnic eruption, which may have been
caused by a landslide, volcanic eruption or cool rainwater. It resulted in the rapid
mixing of the supersaturated deep water with the upper layers of the lake, where
the reduced pressure allowed the stored CO2 to effervesce out of solution
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Document Summary

Eesa11 lec 8 possible questions: what causes the hypoxia problems in the gulf of mexico, hypoxia results from the stratification of marine waters due to mississippi river. System freshwater inflow and the decomposition of organic matter stimulated by. Mississippi river nutrients: *** (know) provide the series of cause-effect relationships that result in fish kills in the. Neuse river estuary: sediment oxygen demand frequency of hypoxia duration of stratification, frequency of hypoxia fish health number of fish kills. Planktonic algae was dominated by blue-green bacteria from 1955-1973. Water quality improvements followed and blue-green algae decreased and have been insignificant since 1976: dr. edmonson found that phosphorus from sewage was fertilizing algae in lake.

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