Our World Unit 6 Crossword

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Across
  1. 3. a material made from chemicals that is light and strong
  2. 4. unknown, hard to explain
  3. 6. a group of animals living together in a specific place
  4. 10. the faint light in the sky when the sun is below the horizon before sunrise
  5. 11. to be no longer seen
  6. 13. a small sea animal that looks like a tube
  7. 14. trash, waste, something thrown away
  8. 15. one of the long, thin parts of some sea animals, similar to a squid's arms
  9. 18. an amount or piece of a substance that covers a surface or that is between two other things
  10. 19. an area that is divided from other areas
Down
  1. 1. dangerous materials that make the air, water, and soil bad
  2. 2. something that is valuable to a country or person
  3. 5. twelve o'clock at night
  4. 7. catching too many fish in an area
  5. 8. a sea animal that has 8 arms, 2 tentacles, and a long body
  6. 9. something that disappears naturally without any treatment
  7. 12. an ocean creature made by a small sea animal
  8. 16. letting light pass through and giving a clear view of objects on the other side
  9. 17. a living person or animal