General Knowledge

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Across
  1. 1. A gas needed by most living things to breathe
  2. 6. The layers of gases surrounding a planet
  3. 7. Tiny single-celled organisms found everywhere
  4. 9. An animal that hunts and eats other animals
  5. 11. A solid with a repeating pattern and smooth flat sides
  6. 14. Land surrounded by water on three sides
  7. 16. A huge group of stars gas and dust held together by gravity
  8. 17. Preserved remains or traces of ancient living things
  9. 19. An object that attracts certain metals like iron
Down
  1. 2. A large slow-moving mass of ice
  2. 3. A closed path that electricity can flow through
  3. 4. The path one object takes around another in space
  4. 5. A warm-blooded animal that usually has hair and produces milk
  5. 8. A tool that shows direction using Earth’s magnetic field
  6. 10. An animal that is hunted by another animal
  7. 12. The regular rise and fall of ocean water caused by the Moon’s gravity
  8. 13. A large object that orbits a star
  9. 15. A mountain that can release lava ash or gas
  10. 16. The force that pulls objects toward each other
  11. 18. Related to the Sun