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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?

Aoil spills Bair pollution Cagricultural chemicals Dsewage discharge

2) The depletion of which essential element is responsible for the Gulf of Mexico dead zone?

Aphosphorus Bsulfur Cnitrogen Doxygen

3) About how much land is drained by the Mississippi River?

A40 percent B80 percent C5 percent D20 percent

4) How do excess nutrients in the Gulf of Mexico affect phytoplankton?

Aallows them to grow to higher than usual levels Bmakes them all die off Cmakes them develop various diseases Dcauses them to move to other bodies of water

5) What factor determines the boundaries of watesheds?

Adistance from a river Bclimate Cstate and country borders Delevation

6) What is hypoxia?

Aa condition of oxygen depletion in water Ba condition of excess silt in water Ca disease that kills fish Da measure of the muddiness of water

7) Which process removes oxygen from water in hypoxic zones?

Aremoval of excess nutrients Bmixing of water by winds Caddition of chlorine Ddecay of phytoplankton

8) Which of the following would help reduce the dead zone in the Gulf of Mexico?

Adecreased fishing activity Bmore fishing activity Cimproved agricultural technologies that reduce nutrient inputs to rivers Dremoval of oil wells in the Gulf

9) What boundary divides water between the Pacific and Atlantic Oceans in North America?

AGulf of Mexico Watershed BOhio River CMississippi River DContinental Divide

10) Where are dead zones found throughout the world?

Asouthern hemisphere only BGulf of Mexico only CNorth America only Din many places worldwide

*select an answer for all questions

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