Across
- 4. lived in small groups with food
- 5. oil ship drowns in sea
- 6. rocks containing the metal
- 7. a uraninun
- 9. oil gas like coal
- 10. machine invented to grind the water
Down
- 1. air and rain combines together
- 2. burning as oil palms
- 3. made in 1920 for the first time
- 8. pests that attack crops