Changing Waterways

Question 1

Explain how pollution affects marine life.

Revolt · Accepted Answer

Pollution introduces toxins, excess nutrients, plastics, and warm water that can poison organisms, create dead zones through algal blooms and oxygen depletion, and disrupt food webs and reproduction.

Question 2

Thermohaline circulation _______.a.supplies heat to polar regionsb.causes salt lake formationc.causes oxbow lake formationd.is unaffected by heat fluctuations

Revolt · Accepted Answer

A

Question 3

Which of the following is not an effect of erosion on lakes?a.water leakageb.wearing away of sidesc.increased water levelsd.basin filling with sediment

Revolt · Accepted Answer

C

Question 4

How can buffer strips have a positive impact on waterways?

Revolt · Accepted Answer

Buffer strips trap sediment and nutrients, stabilize banks, reduce erosion, filter pollutants, and provide habitat corridors that improve water quality and aquatic ecosystem health.

Question 5

Ocean and freshwater contamination _______.a.does not affect marine lifeb.is not affected by agriculturec.results from industrial activityd.is independent of human activity

Revolt · Accepted Answer

C

Question 6

Buffer zones _______.a.can help regulate the acidity of aquatic ecosystemsb.help increase erosion ratesc.are set up around natural resource areasd.all of the above

Revolt · Accepted Answer

A

Question 7

Which of the following statements about the effects of pollution on marine ecosystems is true? a. Burning fossil fuels causes a direct increase in the temperatures of ocean water. b. Burning fossil fuels causes a decrease in the pH of ocean water making it more acidic. c. Pollution in marine ecosystems causes a decrease in the formation of algal blooms. d. Addition of warm water has no effect on marine ecosystems. Please select the best answer from the choices provided

Revolt · Accepted Answer

B

Question 8

Explain how flooding affects rivers and how flooding can be influenced by human activity.

Revolt · Accepted Answer

Flooding erodes riverbanks, deposits sediment, and can change a river’s course. Human activities such as deforestation, urbanization, and dam construction increase runoff and alter natural flow, raising flood risk.

Question 9

Explain how thermohaline circulation is influenced by salinity and temperature.

Revolt · Accepted Answer

Thermohaline circulation is driven by differences in water density caused by temperature and salinity. Colder, saltier water is denser, sinks, and flows along the ocean floor, while warmer, less-saline water rises, creating a global conveyor-belt circulation.

Question 10

How can alternative practices reduce human impact on waterways?

Revolt · Accepted Answer

Alternative practices such as no-till farming, cover crops, buffer strips, reduced chemical use, and wastewater treatment limit runoff, erosion, and pollutant loading into waterways.

Changing Waterways Answers

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