What % of readily usable freshwater is on Earth?

• 71%

• 1%

• 3%

• 97%

This refers to particulate matter that is 2.5 micrometers or less in diameter. These particles are considered fine particles and are among the smallest and most dangerous types of air pollution.

• PM 10

• PM 1

• PM 2

• PM 2.5

Solid waste includes all of the following except;

• food scraps and yard clippings

• junk mail and milk cartons

• ozone and carbon dioxide

• newspaper and soda bottles

The biggest use for fresh water is

• industry

• drinking

• agriculture

• household

What chemical is added during tertiary treatment at a wastewater treatment facility to give a final 'polishing' of the waste stream?

• chlorine

• sodium bicarbonate

• CO2

• methane gas

Municipal solid waste is approximately what percentage of all solid waste?

• 2%

• 90%

• 60%

• 20%

Gasoline leaks on the highway are an example of

• bacterial pollution

• sediment pollution

• chemical pollution

• nutrient pollution

Effluent from _____________ treatment is of a high standard and suitable for reuse.

• Preliminary

• Tertiary

• Primary

• Secondary

It is a waste disposal facility where wastes are put in the ground and covered each day with a layer of dirt, plastic, or both.

• incinerator

• landfill

• aquifer

• compost heap

Leachate is a substance that

• is produced by incinerators

• is produced in a compost pile

• is a byproduct of bacterial digestion

• contains dissolved toxic chemicals