What is the main source of Total Organic Carbon (TOC) in water?

Decaying natural organic matter

What is one way scientists analyze the health of a river?

by measuring its dissolved oxygen

A lake near William's house has water with high turbidity

is cloudy and hard to see through

During a science project, Scarlett observed a pond over several months. What could cause the water temperature in the pond to increase?

Pollution such as sediment in the water

In a study of a local river ecosystem, Aria, Arjun, and Grace are testing for indicators of healthy water systems. Which of the following results would indicate a healthy system? low temperatures, high dissolved oxygen, and neutral pH

low temperatures, high dissolved oxygen, and neutral pH

What is 'pH' referring to in water quality testing?

The measurement of the acidity or basicity of the lake water

Why are too many nutrients (like nitrates and phosphates) bad for our waters?

Nutrients in the water cause too much algae growth, which decrease the level of oxygen in the water.

What is water quality?

It describes the condition of the water

What is the biggest impact of run-off in urban areas on stream health? Options: incised, steep banks and a narrow stream channel due to erosion, high turbidity, high nitrates due to fertilizer, sewage leaks

incised, steep banks and a narrow stream channel due to erosion

What is a impervious surface?

A surface that does not absorb water.

How are watersheds and river basins related?

Many watersheds flow into a river basin.

Which of the following statements best explains why nonpoint pollution is so difficult to prevent? Because nonpoint pollution can be traced to only one source. Because the source of nonpoint pollution is difficult to identify. Because the source of nonpoint pollution may be a factory that can afford large fines. Because nonpoint pollution is mainly from high temperature, which is impossible for us to affect.

Because the source of nonpoint pollution is difficult to identify.

Which of the following best describes the results from these sites? Site 1 is unhealthy because of its dissolved oxygen levels are too high., Site 3 and 4 are unhealthy because the temperature is too low., Site 2 is unhealthy because the pH is too high and the temperature is too low., Site 5 is unhealthy because the temperature is too high and the dissolved oxygen is too low.

Site 5 is unhealthy because the temperature is too high and the dissolved oxygen is too low.

Which of the following best describes the causes of the results from these sites? Options: The pH of site 1 is not within the healthy range. The pH of site 2 is most likely the cause of the temperature results. The pH of site 3 and 4 is most likely the cause of the temperature results. The temperature of site 5 is most likely the cause of the dissolved oxygen results.

The temperature of site 5 is most likely the cause of the dissolved oxygen results.

Which is a true statement of the diagram above? Options: As temperature increases dissolved oxygen increases, As temperature decreases dissolved oxygen decreases, As temperature increases dissolved oxygen decreases, None of the above

As temperature increases dissolved oxygen decreases

Which is responsible for ensuring the safety of our drinking water? Options: EPA (Environmental Protection Agency), NOAA (National Oceanic and Atmospheric Administration)

EPA (Environmental Protection Agency)

An algae bloom in a water system is most likely caused by: high oxygen levels in the water, large amounts of nitrates in runoff

large amounts of nitrates in runoff

Under which condition are large numbers of fish in a lake likely to die? Options: when the water's dissolved oxygen is low and temperature is high, right after a storm with heavy rainfall

when the water's dissolved oxygen is low and temperature is high

Why is the turbidity in lake higher near the shoreline?

because of increase in erosion rate

Water Quality to Prep for ENR CDE Flashcards

Student preview

52 questions

Show all answers

1.

FLASHCARD QUESTION

Front

What is the recommended pH range for drinking water according to WHO?

Back

6.5 to 8.5

2.

FLASHCARD QUESTION

Front

What causes the hardness in water?

Back

Calcium and magnesium

3.

FLASHCARD QUESTION

Front

What is the maximum permissible limit for Total Dissolved Solids (TDS) in drinking water?

Back

1000 mg/L

4.

FLASHCARD QUESTION

Front

What is the safe level of chlorine in drinking water?

Back

4 mg/L

5.

FLASHCARD QUESTION

Front

What is the main use of sulfate in the commercial industry?

Back

Chemical industry

6.

FLASHCARD QUESTION

Front

What does electrical conductivity in water measure?

Back

The ionic process

7.

FLASHCARD QUESTION

Front

What is the safe level of Trihalomethanes (THMs) in drinking water?

Back

80 ppm

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