| A | B |
|---|
| Arable | Farming that only involves crops |
| Renewable resource | Resources that can be replaced easily |
| Fallow | The practice of letting cultivated land rest for a periosd to regain its fertility |
| Desertification | The process of which land becomes desert |
| Sahara Desert | The biggest desert in the world |
| Pastoral | Farming that only involves livestock |
| Non-renewable resource | Resources that are difficult to or cannot be replaced |
| Sulphur | One of the main pollutants in acid rain |
| Green Revolution | The movement to create HYVs |
| Acid Rain | Rain containing harmful amounts of sulphuric and nitric acids |
| Drought | A continuous period with little or no rain |
| Overgrazing | The rearing of too much livestock on too little pasture |
| Urbanisation | The process in which more people come to live in cities |
| Climate | The lnog term trends in weather conditions for an area |
| death rate | The number of deaths per 1000 individuals annually within a population |
| Demography | The study of population statistics and trends |
| erosion | The gradual wearing down of the Earth's surface by wind water and ice |
| global warming | The theory that temperature of the atmosphere an increasing due to the |
| lithosphere | The soil and rock layer of the earth. |
| population density | The number of people per a unit of area |
| population pyramid | A bar graph which displays the age and sex distribution of a |
| precipitation | Any form of water that falls from the atmosphere to the surface of the |
| relief | The difference between the highest and lowest elevations in an area |
| watershed | The area which a river and its tributaries drain |
| weather | short term atmospheric conditions over a certain area |
