Across
- 4. Electricity produced using underground heat sources, such as hot springs and steam.
- 7. A type of farming in which the farmer produces only enough to feed his or her family.
- 8. To separate from one another.
- 9. The trapping or killing of protected wild animals in order to make a profit.
Down
- 1. Measure showing the average number of people living within a square mile or a square kilometer.
- 2. The production of electricity through the use of falling water.
- 3. The process of passing stories by word of mouth from generation to generation.
- 5. The process by which agricultural land is turned into desert.
- 6. A large group of people who can trace their ancestry back to a single individual.