Part A
Depletion of which of the following is causing the dead zone in the Gulf of Mexico?
oxygen
phosphorus
carbon dioxide
nitrogen
Part B
You are an Iowa farmer interested in decreasing the pollutants that are causing the dead zone in the Gulf of Mexico. Which of the following would likely be the best for you to do?
Reduce your fertilizer use.
Reduce your insecticide use.
Increase tillage.
Reduce your herbicide use.
Part C
You research organisms in woodchip bioreactors that decrease dead zone pollutants. Which of the following do you study?
algae
insects
redworms
bacteria
Part D
Which of the following appears to be the best way to reduce dead zone pollutants?
Encouraging farmers to plant more crops.
Using only phosphorus filters.
Using only bioreactors.
Using bioreactors and phosphorus filters.
Part E
Decreasing soil erosion would have which of the following effects?
It would decrease the amount of phosphorus getting into waterways.
It would increase the amount of phosphorus getting into waterways.
It would have no effect on the amount of phosphorus getting into waterways.
It would have volatile effects on the amount of phosphorus getting into waterways.