Waste

Question 1

Volumetrically, the two principal sources of solid waste in the United States are wastes from livestock and from

Answer 1

Mineral extraction and processing

Question 2

After aerobic waste decomposition in a landfill has stopped,

Answer 2

Anaerobic decomposition produces different gases, including methane.

Question 3

Organic matter can be made beneficial by a process known as

Answer 3

Composting

Question 4

The use of plants in the cleansing of water includes all of the following except

Answer 4

Removing oil from ground water.

Question 5

The thickness and __________ of soil are key factors in determining site suitability for a septic system.

Answer 5

Permeability

Question 6

The size of the leaching field a septic system requires is determined

Answer 6

Based on both volume of wastewater anticipated and permeability of the soil.

Question 7

If the half-life of carbon-14 is about 5,700 years, then of a given starting quantity, after 22,800 years (four half-lives), what fraction of the original amount will be left?

Answer 7

1/16

Question 8

Advantages of radioactive-waste disposal in bedded salt deposits include all of the following except

Answer 8

Salt blocks radiation from radioactive decay

Question 9

For the average U.S. resident, the single largest source of radiation exposure is

Answer 9

Exposure to radon gas

Question 10

The disposal rock unit at Yucca Mountain, Nevada is

Answer 10

Rhyolitic tuff