Unwanted or unusable material.

Use of bacteria and enzymes to help destroy toxic or hazardous substances or convert them to harmless compounds.

Managing wastes to limit their environmental harm without trying to reduce the amount of waste produced.

Combined solid wastes produced by households and workplaces other than factories.

Use of natural or genetically engineered plants as "pollution sponges" to absorb, filter, and remove contaminants from polluted soil and water.

Waste disposal site on which waste is spread in thin layers, compacted, and covered with a fresh layer of clay or plastic foam each day.

Solid waste produced by mines, farms, and industries that supply people with goods and services.

Pumping of liquid hazardous wastes under high pressure through a pipe into dry, porous rock formations far beneath aquifers that are tapped for drinking and irrigation water.

Using materials again for the same purpose. Recycling aluminum cans is an example.

Any discarded material or substance that threatens human heath or the environment.

Storage for liquid hazardous wastes in ponds, pits, or lagoons.

Process in which waste materials are converted into different products; for example, used tires can be shredded and turned into rubberized road surfacing.

Answer in order from greatest percent to smallest percent. 27%_____,14.6%____,13.5%____,12.8%____,9.1%____,9%____,6.2%____,4.5%____,3.3%____.

Form of recycling that mimics nature by using bacteria to decompose yard trimmings, vegetable food scraps, and other biodegradable organic wastes into humus, which is an organic component of soil that improves soil fertility.

Reducing the amount of waste produced; wastes that are produced are viewed as potential resources that can be reused, recycled, or composted.