| A | B |
|---|
| crop rotation | a field planted with a certain crop then next year planted with a different crop |
| soil salinization | salt buildup in the soil |
| desertification | process by which the loss of plant cover and soil leads to desert-like conditions |
| reforestation | process by which forests are renewed through the planting of seeds or young trees |
| deforestation | clearing or cutting of trees in a forests |
| sustained yield use | taking products from forests without destroying trees |
| desalinization | change salty seawater into fresh water |
| photochemical smog | produced when sunlight interacts with exhaust gases to produce visible and dangerous pollution |
| acid rain | pollution from factory smokestacks combine with water vapor in atmosphere |
| ozone | gas formed from interaction between oxygen and sunlight in upper atmosphere |
| fossil fuels | formed by remains of prehistoric animals, includes coal, petroleum, natural gas |
| petrochemicals | chemicals produced from petroleum, includes chemical fertilizers, pesticides, explosives |
| geothermal energy | underground that originates in the hot interior of the planet |
| renewable resources | resources that can be replaced by natural processes |
| nonrewable resources | resources that cannot be replaced by natural processes |
