An oxygen sag curve occurs when
a. Fish population numbers sag.
b. Heavy metals that have entered a stream bind oxygen molecules and remove them from the available oxygen supply.
c. The breakdown of biodegradable wastes by bacteria lowers the available oxygen in the water for organisms with high oxygen requirements.
d. Carbon dioxide values exceed dissolved oxygen values.
e. Oxygen content in the air around a particular body of water becomes slightly lower than normal
C
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You have collected data on seismic-wave velocities in rocks that exist a few hundred meters below the surface
Use information in Figure 8.18 to determine what kind of rock(s) is suggested by these P-wave velocities: 2.25 km/s; 4 km/s; 6.25 km/s; 6.75 km/s; 8 km/s. What will be an ideal response?
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What is the geologic definition of soil? How does it differ from other definitions?
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Which of the following is the definition of an essential fatty acid?
A) any fatty acid that the body needs B) any fatty acid that contains more than 14 carbon atoms C) any fatty acid that the body needs, but which it cannot synthesize D) any fatty acid that the body needs and which it must synthesize