AnswersHS Earth and Space Science Sem. 1Lab: Effects of Human Activity on Freshwater Resources

Lab: Effects of Human Activity on Freshwater Resources Answers

12 verified answers
1
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How do acids and bases affect the quality of freshwater sources?

A
Acids and bases raise the pH of freshwater.
B
Acids and bases lower the pH of freshwater.
C
Acids lower the pH of freshwater and bases raise the pH of freshwater.
D
Acids raise the pH of freshwater and bases lower the pH of freshwater.
2
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What did you include in your response? Check all that apply.

A
Filtered polluted water is clearer than unfiltered polluted water.
B
Both unfiltered and filtered polluted water have pH values that are not favorable for organisms that live in and use the water.
C
The quality of water cannot be based on its appearance.
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greater than 6.65equal to 6.65✔ less than 6.65

A
greater than 6.65
B
equal to 6.65
C
✔ less than 6.65
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Think about how acids and bases would affect the water quality in the two lakes.Which set of pH data would you expect to see based on your observations?

A
Lake A: pH = 4.5; Lake B: pH = 7.5
B
Lake A: pH = 8.3; Lake B: pH = 3.7
C
Lake A: pH = 6.6; Lake B: pH = 6.8
D
Lake A: pH = 10.2; Lake B: pH = 1.7
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Compare the appearance and pH of the unfiltered and filtered polluted water. What conclusion can be made based on these observations?

Answer:

The filtered water is clearer than the unfiltered water, which appears cloudy and yellowish. However, the pH readings for both samples remain at levels that are unsafe for living organisms. This indicates that while filtration improved the water's appearance, it did not necessarily make the water safe or clean chemically. Therefore, the conclusion is that the quality of water cannot be determined by appearance alone.

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Which statements describe freshwater sources? Check all that apply.Rainwater can replace or replenish freshwater sources.Precipitation, such as rainwater, is the source of freshwater on Earth.When the amount of surface freshwater increases, so does the amount of groundwater.Human activity, such as taking a bath, may change the quality of a freshwater resource.Pollution in lakes does not affect groundwater because the ground acts as a barrier or filter.

A
Rainwater can replace or replenish freshwater sources.
B
Precipitation, such as rainwater, is the source of freshwater on Earth.
C
When the amount of surface freshwater increases, so does the amount of groundwater.
D
Human activity, such as taking a bath, may change the quality of a freshwater resource.
E
Pollution in lakes does not affect groundwater because the ground acts as a barrier or filter.
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Which human activities would most likely increase turbidity? Check all that apply.

A
cutting down trees
B
building roads in mountains
C
constructing buildings
D
planting gardens in vacant lots
E
removing sediments from sidewalks using water
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Which statements describe turbidity? Check all that apply.

A
Turbidity is a measure of water clarity.
B
Turbidity may be caused by sediments.
C
Turbidity may be a result of human activities.
D
Turbidity increases algae and fish populations.
E
Turbidity is transported to freshwater sources through rain.
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What can people do to lessen the effect of energy production on the pH of freshwater sources? Check all that apply.

A
stop producing electricity
B
produce energy using water power
C
use electricity or energy-saving products
D
create technology to capture sulfur dioxide
E
use petroleum instead of coal to produce electricity
F
increase the use of coal in the production of electricity

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