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Watersheds
Test Description: Reviews basic concepts of watersheds and mississippi river watershed; gulf of mexico dead zone
Instructions: Answer all questions to get your test result.
1) What is the primary culprit behind the dead zone in the Gulf of Mexico?
A
sewage discharge
B
oil spills
C
air pollution
D
agricultural chemicals
2) The depletion of which essential element is responsible for the Gulf of Mexico dead zone?
A
phosphorus
B
sulfur
C
oxygen
D
nitrogen
3) About how much land is drained by the Mississippi River?
A
40 percent
B
80 percent
C
5 percent
D
20 percent
4) How do excess nutrients in the Gulf of Mexico affect phytoplankton?
A
makes them develop various diseases
B
causes them to move to other bodies of water
C
allows them to grow to higher than usual levels
D
makes them all die off
5) What factor determines the boundaries of watesheds?
A
elevation
B
climate
C
state and country borders
D
distance from a river
6) What is hypoxia?
A
a condition of excess silt in water
B
a condition of oxygen depletion in water
C
a disease that kills fish
D
a measure of the muddiness of water
7) Which process removes oxygen from water in hypoxic zones?
A
removal of excess nutrients
B
addition of chlorine
C
decay of phytoplankton
D
mixing of water by winds
8) Which of the following would help reduce the dead zone in the Gulf of Mexico?
A
removal of oil wells in the Gulf
B
decreased fishing activity
C
more fishing activity
D
improved agricultural technologies that reduce nutrient inputs to rivers
9) What boundary divides water between the Pacific and Atlantic Oceans in North America?
A
Continental Divide
B
Ohio River
C
Mississippi River
D
Gulf of Mexico Watershed
10) Where are dead zones found throughout the world?
A
in many places worldwide
B
North America only
C
Gulf of Mexico only
D
southern hemisphere only
*select an answer for all questions
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