Question 1

1.  Which would most likely result from a DECREASE in the water supply to a watershed?

Accepted Answer

Decrease in river basin levels

Answer

Increase in ocean water levels

Answer

Decrease in lake water levels

Question 2

2.  The drain in a sink would represent which part of a river basin?

Accepted Answer

Water flowing into the ocean.

Answer

a mountain stream

Answer

a meander

Answer

River rapids

Question 3

3.  Which best describes the importance of an aquifer?

Accepted Answer

It holds uncontaminated ground water for human use.

Answer

It provides water for oceans.

Answer

It supplies all the water for lakes and rivers

Question 4

4.  Which represents the distribution of water on Earth?

Accepted Answer

3% freshwater, 97% salt water

Answer

71% fresh water, 29% salt water

Answer

97% fresh water,  3% saltwater

Answer

29% fresh water, 71% salt water

Question 5

5.  What BEST describes the amount of frozen water on Earth?

Accepted Answer

About 2% of the Earth's water is frozen.

Answer

Exactly 0.9% of the Earth's water is frozen.

Answer

About 35% of Earth's water is frozen.

Question 6

6.  Which type of water reservoir  contains the largest volume of freshwater?

Accepted Answer

Ice sheets

Answer

Rivers

Answer

Lakes

Answer

Aquifers

Question 7

7.  Where is the majority of Earth's freshwater located at? (Look at #6!)

Accepted Answer

Ice

Answer

lakes

Answer

groundwater

Answer

oceans

Question 8

8.  Which statement about ocean currents is the most accurate?

Accepted Answer

Ocean currents stir nutrients and bring them to the surface to help in the production of algae.

Answer

Ocean currents influence life at the shore.

Answer

Ocean currents keep the ocean temperature unstable.

Answer

Ocean currents are a major cause of glacier formation.

Question 9

9.  Which technology has allowed scientists to accurately map the ocean floor?

Accepted Answer

Satellites

Answer

Sonar

Answer

submersibles

Answer

Scuba gear

Question 10

10.  How do oceanic upwellings help microscopic plankton to grow?

Accepted Answer

They bring dissolved nutrients to the surface of the ocean.

Answer

They bring warmer water to the surface of the ocean.

Answer

They decrease the levels of oxygen at the surface of the ocean.

Answer

They decrease the amount of nutrients at the surface of the ocean.

Question 11

11.  Which best explains why there is a greater concentration of oxygen located near the ocean's surface?

Accepted Answer

Algae or phytoplankton, release oxygen and live near the surface of the ocean where they receive large amounts of sunlight.

Answer

Sunlight warms the ocean's temperature and stimulates oxygen production near the surface.

Answer

Plankton produces excess amounts of nutrients that remove oxygen levels from the atmosphere.

Answer

Marine life (fish and ocean animals) give off oxygen instead of carbon dioxide, which makes the ocean water rich in oxygen.

Question 12

12.  Which is the most likely result of an INCREASE in the level of nitrates in a body of water?

Accepted Answer

Nitrates would cause an increase in plant growth.

Answer

Nitrates would cause an increase in turbidity

Answer

Nitrates would cause an increase in the fish population.

Answer

Nitrates would cause an increase in water temperature.

Question 13

13.  How do algae blooms affect the health of a water system?

Accepted Answer

Algae can block sunlight and their decomposition decreases dissolved oxygen in the water, making the water quality unhealthy.

Answer

Algae does photosynthesis and DECREASES  the amount of dissolved oxygen which INCREASES the water quality.

Answer

Algae does photosynthesis and INCREASES the amounts of dissolved oxygen which DECREASES  the water quality.

Question 14

14. Students monitored the turbidity in a local river for a week and recorded the data.  Based on what you know about turbidity and dissolved oxygen, what day would the dissolved oxygen most likely be the lowest?

Accepted Answer

Day 4- turbidity is 8.3 NTU

Answer

Day 5- turbidity is 7.9 NTU

Answer

Day 6- turbidity is 2.5 NTU

Answer

Day 2- turbidity is 1.8 NTU

Question 15

15. What may cause scientists to be concerned about the quality of lake water?  ( What would cause it to be unhealthy?)

Accepted Answer

high levels of nitrates

Answer

high levels of oxygen

Answer

low levels of arsenic

Answer

low levels of salt

Question 16

16. Why does a cloudy river produce LESS plant life than a clear river does?

Accepted Answer

A cloudy river blocks sunlight from reaching water plants, while a clear river allows sunlight to be absorbed by plants who need it to do photosynthesis.

Answer

A cloudy river flows freely, while a clear river does not.

Answer

A cloudy river absorbs little heat, while a clear river absorbs a lot of heat.

Answer

A cloudy river has few dissolved nutrients, while a clear river has many.

Question 17

17. What does pH measure?

Accepted Answer

pH measures acidity/ alkalinity (basic)

Answer

pH measures turbidity

Answer

pH measures dissolved oxygen

Answer

pH measures nutrient levels

Question 18

18.  What effect does fertilizer runoff have on North Carolina lakes and streams?

Accepted Answer

The fertilizer causes some organisms to grow but it can hurt other organisms.

Answer

The fertilizer causes the water to become hotter, which kills certain fish.

Answer

The fertilizer causes teh water to have too much oxygen which will kill aquatic plants.

Answer

The fertilizer causes fish to become sterile, preventing them from reproducing.

Question 19

19.  Which of the following could occur as the result of RUNOFF of high nitrate fertilizers from farms near a lake?

Accepted Answer

An increase in algae growth which results in low oxygen levels in the lake.

Answer

A decrease in mineral storage which reduces carbon levels in the lake.

Answer

An increase in deforestation  which reduces the animal populations in the lake area.

Answer

A decrease in pollution which results in lower ozone levels in the lake.

Question 20

20.  Which best explains the difference between  primary and secondary sewage  treatment?

Accepted Answer

Primary treatment removes the solid materials.

Answer

Primary treatment removes phosphates and nitrates.

Answer

Secondary treatment removes all o f the pollutants.

Answer

Secondary treatment is less expensive.

Question 21

21.  Which is the most beneficial reason for installing a water softener?

Accepted Answer

The amount of calcium and magnesium in the water will be reduced.

Answer

The amount of hydrogen in the water will be reduced.

Answer

The cost of water will be reduced.

Answer

The number of bacteria in the water will be reduced.

Question 22

22.  Which activity within a river basin would most likely contribute to the pollution of a river?

Accepted Answer

Using a hose to wash motor oil from a concrete driveway.

Answer

Washing a muddy truck on a grass lawn

Answer

Washing used paint brushes in a garage utility sink

Answer

Using a broom to sweep dirt from a parking lot.

Question 23

23.  How does acid rain affect the pH of a stream?

Accepted Answer

When the acid rain finds its way into the stream the pH in the stream can decrease.

Answer

Pollution causes less photosynthesis, which may cause long term stability in pH.

Answer

When the acid rain finds its way into the stream,  the pH in the stream can increase.

Question 24

24.  How often is it recommended to test the aquatic health of a stream or river?

Accepted Answer

Many times a year at many different depths

Answer

Once a year at many depths.

Answer

Once every ten years.

Answer

At the surface,  once every year.

Question 25

25.  Which is NOT an indicator of good water quality?  (3 do test good water quality and one does NOT)

Accepted Answer

fecal coliform bacteria

Answer

oysters

Answer

trout

Answer

stonefly larvae

Related quizzes

Related quizzes