Allowing the topsoil to be carried away by runoff.
B.
Planting crops on a slope.
C.
Reducing the amount of humus in the soil.
D.
Planting crops in “steps” called terraces.
3.
Why is chlorine added to drinking water?
A.
To make it taste better.
B.
To kill bacteria.
C.
To turn salt water into fresh water suitable for drinking.
D.
To prevent chlorine from entering the soil.
4.
Look at the table which shows the energy consumption by the United States and answer: During which ten-year period did the U.S. energy show the greatest increase?
A.
1990 to 2000
B.
1985 to 1995
C.
1975 to 1985
D.
1995 to 2000
5.
Energy from running water is used to generate...
A.
solar energy.
B.
wind energy.
C.
hydroelectricity.
D.
geothermal energy.
6.
Which type of energy could be BEST used in a geyser-filled area?
A.
Hydroelectricity.
B.
Solar energy.
C.
Wind energy.
D.
Geothermal energy.
7.
Biomass conversation generates energy from:
A.
plant and animal wastes.
B.
running water.
C.
sunlight.
D.
moving air.
8.
The Arizona desert would be a good location fro which alternative energy source?
