Question 1

Which of the following statements best explains why groundwater depletion is a significant concern in many regions?

Accepted Answer

Aquifers recharge slowly, making it easy to extract water faster than it can be replaced.

Question 2

A city diverts water from a rural lake to supply its population. Which of the following is a likely ecological consequence of this action?

Accepted Answer

Reduced water levels, leading to habitat loss for aquatic species.

Question 3

Which of the following best distinguishes point-source pollution from non-point source pollution?

Accepted Answer

Point-source pollution comes from a single, identifiable location, while non-point source pollution comes from multiple, diffuse sources.

Question 4

Which of the following is a primary reason why desalinization is not widely used as a solution to water scarcity?

Accepted Answer

It produces large amounts of salty waste and is energy-intensive.

Question 5

A farmer wants to reduce water loss from irrigation. Which of the following strategies would be most effective?

Accepted Answer

Lining irrigation canals to prevent leaks.

Question 6

Which of the following best describes the process of eutrophication in lakes?

Accepted Answer

An increase in nutrients causing algal blooms and decreased oxygen.

Question 7

Which equation best represents the water balance in a watershed, where $$P is $$precipitation, $$E is $$evaporation, $$R is $$runoff, and $$I is $$infiltration?

Accepted Answer

$$P = E + R + I$$

Question 8

Which of the following is a direct consequence of saltwater intrusion into coastal aquifers?

Accepted Answer

Contamination of freshwater supplies with saltwater.

Question 9

Which of the following best describes the function of wetlands in a watershed?

Accepted Answer

They slow runoff, filter pollutants, and recharge aquifers.

Question 10

A city is considering building a dam on a major river. Which of the following is a likely environmental impact of this action?

Accepted Answer

Alteration of stream habitat and flooding of natural areas upstream.

Question 11

Which of the following best describes an artesian (confined) aquifer?

Accepted Answer

An aquifer trapped between two less permeable layers, with water under pressure.

Question 12

Which of the following is a major legislative act in the United States that addresses water pollution?

Accepted Answer

The Clean Water Act of 1977.

Question 13

Which of the following is a potential danger of hydraulic fracking to groundwater resources?

Accepted Answer

It may introduce chemicals into groundwater supplies.

Question 14

Which of the following best describes the littoral zone of a lake?

Accepted Answer

The shallow area near the shore with rooted plants.

Question 15

Which of the following is the most sustainable way to reduce residential water use in arid regions?

Accepted Answer

Using xeriscaping with drought-tolerant plants.

Question 16

Which of the following is a real-world example of non-point source pollution?

Accepted Answer

Runoff of fertilizers from multiple farms into a river.

Question 17

Which of the following best explains why preventing water pollution is generally more effective than cleaning it up after contamination?

Accepted Answer

Prevention avoids the high cost and difficulty of remediation, especially for groundwater.

Question 18

Which of the following best describes the relationship between agriculture and freshwater use globally?

Accepted Answer

Agriculture accounts for approximately 70% of annual freshwater use.

Question 19

Which of the following is a direct effect of over-withdrawing groundwater in coastal areas?

Accepted Answer

Saltwater intrusion into freshwater aquifers.

Question 20

Which of the following best describes the main function of a water treatment facility's secondary treatment process?

Accepted Answer

Decomposition of organic pollutants by bacteria.

Freshwater Systems & Resources: Structure, Distribution, Human Impact, and Solutions

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