Homework 8, due Wed Dec 1, 2010
			ENVR 30: Fall 2010 


1. Nebraska, Kansas and parts of Texas get much of their water from
a. The Colorado river
b. Local rain water
c. The Ogallala aquifer
d. Canals from the Mississippi/Missouri River
e. None of the above

2. List several positive things and several negative things about desalination
as a solution to the world's upcoming water shortage.


3. Is ground water a renewable resource or not?  Explain.

4. Is saving the spotted owl important?  Why or why not?

5. What is the extinction vortex?  Name a species that is now in this vortex.

6. One valid estimate of the land species number on the Earth is 
A. 1 million to 4 million 
B. 4 million to 100 million 
C. 100 million to 500 million 
D. 500 million to 1 billion 

7. Ecological extinction means that the species is 
A. completely extinct 
B. rare but still having an ecological impact 
C. rare to the point it has no ecological impact 
D. recovering its numbers in an area 

8. The rainforests contain about what percentage of the species of the world.
A. 10 
B. 30 
C. 50 
D. 90 

9. Most analysts agree that the MVP of a population must be at least a few _______ to ensure long-term survival.
A. dozen 
B. hundred 
C. thousand 
D. million 

10. The sea otter and the spotted owl are respectively:
a. Indicator and Keystone species
b. Keystone and Indicator species
c. Keystone and Predictor species
d. Predictor and Indicator species
e. Both Indicator species
f. Both Keystone species

11. Select the geographic region of the U.S. which has the most remaining natural vegetation.
A. Central
B. South-western Coastline
C. Desert-like regions in the Western U.S.
D. North Eastern U.S.

12. According to the United Nations, the recommended daily amount of Calories 
per person is: 
A. 1500 
B. 900 
C. 2950 
D. 3400 

13. The largest average consumption of meat per year occurs among persons in 
A. Egypt 
B. India 
C. Japan 
D. the United States 

14. Currently about 1.5 Billion hectares are used for croplands and 3.3 billion 
hectares are used for grazing animals.  
The total amount of cultivable land in the world could be as high as 
A. 4 Billion hectares
B. 6 Billion hectares
C. 12 Billion hectares
D. 24 Billion hectares

15. The peak of grain production per person worldwide was reached in 
A. 1972 
B. 1984 
C. 1990 
D. 1994 
E. 2008

16. Which of the following will not reduce desertification?
A. planting trees
B. increasing soil coverage
C. decreasing grazing
D. increasing irrigation

17. The bacterium Bacillus thuringiensis (Bt) produces a toxin against 
A. birds 
B. caterpillars 
C. humans 
D. plants 

18. Ozone
a. is a pollutant in the troposphere and good in the stratosphere
b. is good in the troposphere and good in the stratosphere
c. is a pollutant in the troposphere and a pollutant in the stratosphere
d. is pollutant in the troposphere and good in the stratosphere

19. Which is NOT a green house gas?
a. CO2
b. methane
c. CFC's
d. water
e. NaCl

20. If water is a green house gas, why don't we hear much about it?
a. Water is acts as a coolant;  it's not a greenhouse gass
b. It's effects are cancelled out by other things
c. It's concentration in the atmosphere is not controlable by humans
d. The media doesn't mention it because it would show global warming is a hoax
e. It is a very weak greenhouse gas.