Chapter 2 - Freshwater Resources

The process of obtaining fresh water from salt water is called...

• desalination.

• filtration.

• conservation.

• coagulation.

Using less water so that it will not be used up is called...

• desalination.

• distribution.

• conservation.

• irrigation.

Which of the following is a way to conserve water?

• taking longer showers
• reusing water in a factory to cool hot machinery
• letting the water run while you brush your teeth
• using open ditches to carry water for irrigation

Which of the following is NOT a method for the desalination of ocean water?

• evaporating the water, then allowing the vapor to condense
• freezing the water
• aerating the water
• filtering the water under high pressure

Why might chlorine be added to drinking water?

• Chlorine improves the taste of water.
• Chlorine softens hard water.
• Chlorine kills disease-causing microorganisms.
• Chlorine prevents water from becoming cloudy.

What percentage of global water use is domestic?

• 10%

• 20%

• 70%

What percentage of global water is used for agriculture?

• 10%

• 20%

• 70%

What percentage of global water is used in industry?

• 10%

• 20%

• 70%

The world is running out of water.

• True

• False

What percentage of the Earth's water is fresh? 

• 3%
• 10%
• 20%
• 97%