| A | B |
|---|
| Rift | The separation that forms when two plates separate |
| Desertification | Fertile land becomes a desert |
| Geothermal energy | Energy made by heat underground, in the Earth's core |
| Hydroelectric energy | Energy produced by flowing water |
| Refuge | Someone who flees their country for safety, due to war, persecution or a natural disaster |
| Imperialism | A policy in which a country gains control over other parts of the world |
| Genocide | Mass murder of an ethnic group |
| Tribute | Money that is paid to another country for protection, or to surrender |
| Population density | The average number of people living in a square mile (or square km) |
| Clan | A group of people with common ancestry |
| Oral tradition | Stories, poetry and songs that are passed down through the generations |
| Subsistence | A farmer producing only enough food to feed his/her family |
| Poaching | Illegal fishing or hunting |
