| A | B |
|---|
| Topsoil | the surface layer of soil |
| Erosion | is the movement of rock soil and sand by wind and water |
| Desertification | process by which land is arid or semiarid areas become more desert like |
| Compost | partly decomposed materiel |
| Saliniation | accumulation of salts in soil |
| Pesticides | chemicals used to to kill pest |
| Genetic engineering | genetic material in living cell is modified for medical or industrial use |
| domesticated | bred and managed for human use |
| Overharvesting | catching or harvesting more individuals than the population can replace |
| Aquaculture | raising aquatic organisms for human use or consumption |
| ruminants | Cattle sheep and goats |
