people and planet

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