Question 1

How does the amount of water present on Earth today compare with the amount present millions of years ago?

Accepted Answer

There is about the same amount of water on Earth today

Answer

There is significantly more water on Earth today.

Answer

There is significantly less water on Earth today.

Question 2

2.  What is the biggest cause of decreasing water availability in North Carolina?

Accepted Answer

increase in population

Answer

evaporation

Answer

global warming

Question 3

3.  Which represents the distribution of water on Earth?

Accepted Answer

3% freshwater, 97% salt water

Answer

71% freshwater, 29% saltwater

Answer

97% fresh water, 3% saltwater

Question 4

4.  What is the hydrosphere?

Accepted Answer

All of the water in Earth's[ oceans, lakes, seas, rivers, and glaciers, plus the water in the atmosphere

Answer

All of Earth's organisms and the environments in which they live

Answer

Only the water located in the ocean

Question 5

5.  Which of the following is NOT one of the unique properties of water?

Accepted Answer

Ability to change phases

Answer

High specific heat

Answer

cohesion

Question 6

6.  What is a river basin?

Accepted Answer

The land drained by a river and its tributaries.

Answer

The land formed when rivers create estuaries and marshes

Answer

The land formed as a result of a river flooding.

Question 7

7.  Why are estuaries important?

Accepted Answer

Estuaries are where freshwater and saltwater collide , resulting in a large amount of biodiversity

Answer

Estuaries are tropical areas that support an abundance of life found usually in cold regions of the ocean.

Answer

Estuaries are freshwater areas that support a large amount of living things.

Question 8

8. Which two water cycle processes cause the ocean's salinity to change the most?

Accepted Answer

Precipitation and evaporation

Answer

Evaporation and condensation

Answer

Transpiration and precipitation

Question 9

9.  What is the movement of cold, nutrient rich waters from the bottom of the ocean called?

Accepted Answer

Upwelling

Answer

Precipitation

Answer

Eutrophication

Question 10

10.  In which ocean zone is it the most difficult to survive because of daily changing environment?

Accepted Answer

Intertidal zone

Answer

The aphotic zone

Answer

The neritic zone

Question 11

11.  Which of the following best describes the relationship between dissolved oxygen and fish?

Accepted Answer

Low dissolved oxygen causes fish to die, while high dissolved oxygen causes fish to thrive.

Answer

Low dissolved oxygen has no effect on fish, while high dissolved oxygen causes fish to migrate.

Answer

Low dissolved oxygen causes fish to thrive, while high dissolved oxygen causes fish to die.

Question 12

12.  What might happen if high nitrogen fertilizers are washing to a nearby lake by runoff?

Accepted Answer

An increase in algae growth resulting in low oxygen levels in the lake

Answer

A decrease in pollution resulting in lower ozone levels in the lake

Answer

A decrease in mineral storage reducing the carbon levels in the lake

Question 13

13.  How does the use of a pH meter help to monitor the hydrosphere?

Accepted Answer

By indicating whether the water is too acidic or too basic

Answer

By indicating if there is too much sediment in the water.

Answer

By indicating if there is enough dissolved oxygen in the water.

Question 14

14.  Which temperature is most likely the best for the health of river organisms?

Accepted Answer

82 degrees

Answer

86 degrees

Answer

90 degrees

Question 15

15.  How are bioindicator species used like a warning system for lakes and streams?

Accepted Answer

Their numbers indicate whether the water is polluted

Answer

They indicate when food sources are declining

Answer

Their numbers indicate when food is plentiful.

Question 16

16.  How might a nuclear power plant pollute the water near it if NO WASTE material is added to the water?

Accepted Answer

By heating the water and dropping the oxygen levels

Answer

By adding toxic chemicals to the water.

Answer

By cooling the water and dropping the oxygen levels

Question 17

17.  What is being observed when a scientist looks at a river's turbidity?

Accepted Answer

Cloudiness of the water

Answer

Salinity levels

Answer

Rate of water flow

Question 18

18.  Which best explains why water quality standards are necessary?

Accepted Answer

To prevent water from having excessive levels of pollution which might harm organisms.

Answer

To prevent water from having ANY trace of pollutants.

Answer

To keep the water clear looking

Question 19

19.  Which two behaviors best demonstrate stewardship of our water?

Accepted Answer

Reducing consumption and recycling wastes

Answer

Increasing consumption and discarding wastes

Answer

Reducing consumption and discarding wastes

Question 20

20.  Which best explains why nonpoint pollution is so hard to control?

Accepted Answer

Nonpoint pollutants CANNOT be easily traced back to their sources

Answer

Nonpoint pollutants are all gaseous and invisible which makes them hard to find.

Answer

Nonpoint pollutants have no odor so they can't be traced.

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