| Term | Definition |
| solid waste | is any discarded solid materials |
| biodegradable | it can be broken down by biological processes |
| non-biodegradable | it can not be broken down by biological processes |
| municipal waste | waste that is produced by households and bussinesses |
| landfill | a permanent waste disposal facility where wastes are pin in the ground and convered wach day with a layer of soil |
| leachate | is a liquid that has passed trhopugh compacted solid waste in soils |
| source reduction | is any change in design, manufacture, purchase or use of materials or products to reduce their amount of toxicity before they go into municipal solid waste |
| recycling | is the process of reusing materials or recovering valuable materials from waste or scrap |
| compost | a dark brown curmbly material made from decomposed plant and animal matter that is spread on gardens and fields to enrich the soil |
| hazaardous waste | anyu waste that is a risk to the health of humans or other living things |
| deep well injection | a process in which wastes are pumped deep into the ground where they are absorbed into a dry layer of rock below the level of ground water |
| surface impoundment | a pond that has a sealed bottom which stores waste |