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Changing Waterways Answers

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1
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Which of the following practices could help reduce erosion of water banks?

A
buffer strips
B
natural fertilizers and pesticides
C
decrease in fossil fuel emissions
D
all of the above
2
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How does the loss of vegetation on shore lines affect waterways?

A
decreased sedimentation
B
increased shorelines
C
increased erosion of water banks
D
none of the above
3

Which of the following methods would help decrease marine pollution?

A
government regulation of agriculture
B
government regulation of industry
C
reduction in chemical use
D
all of the above
4

How is thermohaline circulation influenced by salinity and temperature?

A
It is driven by density gradients, which are affected by salinity and temperature, with cold water and water with higher salt concentrations being more dense.
B
It is driven by density gradients, which are affected by salinity and temperature, with warm water and water with higher salt concentrations being more dense.
C
It is driven by density gradients, which are affected by salinity and temperature, with warm water and water with lower salt concentrations being more dense.
D
It is driven by density gradients, which are affected by salinity and temperature, with cold water and water with lower salt concentrations being more dense.
5

How does pollution affect marine life?

A
Pollution causes a decrease in phytoplankton populations and therefore a decrease in the occurrence of algal blooms.
B
Pollution causes destruction of coral reefs, which are important sources of shelter and breeding for marine animals.
C
Soaps, detergents, and plastics in the ocean decrease the acidity of ocean water, leading to a decrease in carbonate levels.
D
Pollution affects organisms close to the shoreline, but does not affect marine organisms far from the shore.
6

Over time, most lakes grow larger due to erosion.

A
T
B
F
7

Recreational activities can cause an increase in erosion rates.

A
T
B
F
8

Which of the following is an effect of fossil fuel emission on oceans?

A
decreased pH
B
decreased carbonate concentrations
C
increased CO2 absorption
D
all of the above
9

The majority of the debris found in the garbage patch is _______.

A
large plastic bottles
B
sewage
C
trash from landfills
D
small pieces of plastic
10

How does flooding affect rivers?

A
It causes river bends to be cut off.
B
It picks up deposits from floodplains.
C
It causes rivers to divert.
D
It causes river channels to change shape.

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