1. What percentage of the earth's surface is covered by water?
a. 40%
b. 80%
c. 92%
d. 65%
A: b
2. Water is found on earth naturally in three forms. What are they?
A: solid, liquid, gas
3. People can survive for this long without water.
a. a few seconds
b. a few weeks
c. a few days
d. a few months
A: c
4. What amount of water on earth is available for our consumption?
a. 10%
b. 25%
c. 80%
d. less than 1%
A: d
5. Water moves from place to place and changes states in a process called the __________.
A: water cycle
6. The volume of earth's water is constantly changing. (true or false)
A: false
7. Potable water is drinkable water. (true or false)
A: true
8. The chemical symbol for water is _________.
A: H2O
9. The steps of the water cycle are ________________, _________________, ______________, _________________ and ________________.
A: evaporation, condensation,
precipitation, percolation, runoff
10. The energy to make the water cycle work is provided by
a. the solar system
b. the sun
c. decomposition
d. the moon
A: b
11. Precipitation can be in the form of
a. rain
b. sleet
c. snow
d. all of the above
A: d
12. MWD staff monitors water quality around-the-clock, and performs more than _________ tests each year to ensure drinking water safety, taste and clarity.
a. 300
b. 3,000
c. 30,000
d. 300,000
A: d
13. You can conserve water by
a. not using your toilet as a trash can
b. turning off the faucet as you brush your teeth
c. taking a 3-5 minute shower
d. all of the above
A: d
14. The water coming out of your faucet could contain molecules that dinosaurs drank. (true or false)
14. true
15. The process of adding a chemical to kill waterborne microorganisms is?
a. sedimentation
b. flocculation
c. disinfection
d. filtration
A: c
16. To flush a toilet, how much water is used?
a. 1-3 gallons
b. 4-7 gallons
c. 8-11 gallons
d. 12-15 gallons
A: b
17. Running a dishwasher once a day takes how much water?
a. 15 gallons
b. 18 gallons
c. 20 gallons
d. 22 gallons
A: a
18. Turning the water off while you brush your teeth saves how much water per brushing?
a. gallon
b. 1 gallon
c. 2.5 gallons
d. 3.5 gallons
A: d
19. Underground water basins are called?
a. aqueducts
b. aquifers
c. surface runoff
d. canals
A: b
20. A: reclaimed
