Unit Test: Earth's Water

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Take this practice test after you have studied for the unit test. Be sure to review any items you missed once you get your results.

1. Pictured below, this tightness across the surface of water is caused by the polarity of water molecules. *

1 point

adhesion

surface tension

capillary action

cohesion

2. Which below correctly describes the polarity of a water molecule? *

1 point

hydrogen & oxygen atoms have a positive (+) charge

hydrogen atoms have a negative (-) charge; the oxygen atom has a positive (+) charge

hydrogen atoms have a positive (+) charge; the oxygen atom has a negative (-) charge

hydrogen & oxygen atoms have a negative (-) charge

3. Water created the Grand Canyon. It can dissolve many substances over time. it is called a ____________ *

1 point

universal element

universal solute

universal solvent

universal compound

4. What percentage of the water on Earth is salt water? *

1 point

97%

75%

25%

5. Nearly 68% of Earths freshwater can be found _______ *

1 point

in the four major oceans

in lakes and rivers

in underground aquifers

masses of ice near the north & south pole

6. Which of the following are abiotic factors in an ecosystem? *

1 point

water

temperature

soil

bacteria

plants

air

algae

Required

7. The land that drains the water into a river system is called a _________________________. *

1 point

aquifer

watershed

reservoir

wetland

8. How healthy an ecosystem is depends in the ______________ *

1 point

biotic factors

air movement

water quality

abiotic factors

9. The area that separates one watershed from another is called a ____________________ *

1 point

divide

tributary

hill

estuary

10. When pollutants are carried away from the land in runoff, they do not always reach larger bodies of water because _____. *

1 point

tributaries collect pollutants

river dams clean the water

wetlands trap pollutants

the soil pulls pollutants out

11. Which body of water contains the highest salinity? *

1 point

Estuary

Lake

River

Ocean

12. The largest estuary in the United States is the ____________________________.

1 point

Mississippi

North Carolina Sound

Chesapeake Bay

Lake Superior

Clear selection

13. This is an area located between dry land and a body of water (as pictured below)?

1 point

watershed

wetland

estuary

tributary

Clear selection

14. Which of the following do wetland do? (Choose all that apply) *

1 point

filter out pollution from run-off

provide habitats for animals

create rivers and canyons

control flooding by soaking up excess water

Required

15. What does pH measure in water? *

1 point

amount of salt in the water

how much heat is in the water

the clarity of the water

The acidity or basicity (alkaline) of the water

16. Which below are all factors of water quality? *

1 point

turbidity

dissolved oxygen

temperature

salinity

Required

17. Jimmy tested a sample of water from a nearby lake that wasn't very clear. He noticed that there were many macro-invertebrates living in the lake. This indicates that the water quality of the lake is most likely _______________. *

1 point

good

brackish

poor

high in salinity

18. The clarity of the water is a factor of water quality. In the picture below, the lake water is very murky. If tested, the water would have a high ___________ level. *

1 point

salinity

turbidity

phosphate & nitrate

19. How can humans protect Earth's water? (Choose all that apply) *

1 point

reduce

reuse

ratify

refill

recycle

reconstruct

Required

20. Which examples will cause point-source pollution to a river? (Choose all that apply) *

1 point

many nearby farms creating fertilizer runoff into near-by river

a group of cows wading (standing) in a river each day

a gasoline powered fishing boat driving down the river

a man standing in the river fishing

Required

21. Pollutants contaminating the starred location on the VA map below would affect the ______________. *

1 point

Mississippi River

North Carolina Sound

Gulf of Mexico

Chesapeake Bay

22. Why is it important to keep pollution out of the nearest stream or river? *

1 point

The pollution decreases soil erosion from the banks of the river or stream.

The pollution found in the local stream or river eventually flows into the ocean.

The pollution increases the biodiversity of the stream or river.

The pollution enhances the nutrients found in the stream or river causing plant life to grow.

23. Irrigation systems are most helpful with _____. *

1 point

producing crops

providing drinking water

flood control

providing hydroelectric power

24. In the winter, why is Virginia’s coastal area warmer than the central and western areas of the state? *

1 point

The air heats up as it moves from western

It snows more along the coast.

Ocean water holds heat longer than land and keeps coastal areas warmer

Ocean water loses heat very rapidly and the heat spreads to the coastal areas

25. What does the term brackish mean? *

1 point

Water polluted by farm run-off

Brownish water with a high turbidity and low dissolved oxygen levels

A mixture of glacier and river water

A mixture of fresh and salt water

26. In which watershed is Prince William County located? *

1 point

James

Rappahannock

Potomac

Shenandoah

27. A flowing stream or river that empties into a larger body of water *

1 point

estaury

tributary

watershed

reservoir

28. Which of these describes when sediment is transported from one location to another? *

1 point

deposition

weathering

soil movement

erosion

29. The breaking down of rock into sediment can be done by wind, animal action, water, or plants. The picture of the rock below has been split in half by a tree. This is an example of ___________________. *

1 point

physical weathering

chemical weathering

erosion

deposition

30. Rust can form on rock when it is exposed to water and oxygen, This process is called oxidation and can cause the rock to breakdown into sediment. This is an example of _______________________. *

1 point

physical weathering

erosion

chemical weathering

deposition

31. The Ogallala is located in the midwest of the U.S. It is the main water supply for Agriculture there. The Ogallala is a(n)___________ which is an underground body of water trapped in rock and/or other sediment. *

1 point

reservoir

watershed

tributary

aquifer

32. The largest watershed in the U.S. is the ___________ *

1 point

Chesapeake Bay watershed

Potomac watershed

Mississippi watershed

James watershed

Submit

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