| A | B |
|---|
| pollution | presence of harmful substances in the environment |
| pollutants | substances that are harmful to living things |
| garbage | waste materials |
| chemicals | pesticides, CRCs, PCBs that create hazardous waste |
| radioactive wastes | nuclear substances that take thousands of years to become safe |
| heat pollution (global warming) | an increase of temperature in the atmosphere caused by too much carbon dioxide |
| noise pollution | exposure to sounds that affect hearing |
| renewable resource | a resource that can be used over and over or can be replaced quickly |
| nonrenewable resource | resources that are used or cannot be replaced in a short time |
| alien species | an organism that invades a new space; may "take over" its new habitat |
| overpopulation | too many organisms for the amount of resources needed |
| biodiversity | variety of life |
| deforestation | clearing of all trees from the land |
| wetlands | areas that soak up water, prevent soil erosion and recharge underground water |
| marine habitats | related to oceans |
| biodegradable | can be broken down by the environment |
