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WorksheetsThe Dead Zone
Total questions: 11
Worksheet time: 6mins
Name
Class
Date
1.
An excess of which of the following would most likely be associated with the formation of a dead zone?
a)
Carbon
b)
Oxygen
c)
Nitrogen
d)
Iron
2.
Which of the following is not a source of nitrogen and phosphorous to a river?
a)
Fertilizers
b)
Animal waste
c)
Wastewater
d)
Burning fossil fuels
3.
What does DO stand for?
a)
Dissolved oxygen
b)
Dissolved osmium
c)
Dissolved ozone
4.
The term hypoxic means...
a)
DO content is less than 2 mg/L, but is still above zero
b)
DO content is 0 mg/L
c)
DO content is greater than 2 mg/L
d)
DO content is 6 mg/L
5.
Typically, dissolved oxygen is expressed as
a)
milligrams per milliliter
b)
pounds per liter
c)
grams per liter
d)
milligrams per liter
6.
This term refers to an ecological imbalance caused by excess nutrients
a)
Eutrophication
b)
Nitrification
c)
Decomposition
d)
Photosynthesis
7.
Which of the following correctly expresses the relationship between decomposition and dissolved oxygen?
a)
Decomposition releases dissolved oxygen into the water
b)
Decomposition uses dissolved oxygen, removing it from the water
c)
Decomposition does not require dissolved oxygen
d)
Decomposition creates dissolved oxygen
8.
Which of the following DO content would be considered "normal" and supportive of marine life?
a)
0 mg/L
b)
1 mg/L
c)
6 mg/L
d)
2 mg/L
9.
The term "anoxic" refers to an absence of what?
a)
carbon
b)
nitrogen
c)
oxygen
d)
phosphorous
10.
True or false: dead zones can occur in both fresh and marine waters around the world.
a)
True
b)
False
11.
How is DO content related to water temperature?
a)
the colder the water, the more dissolved oxygen there is
b)
The warmer the water, the more dissolved oxygen there is
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