An ancient murder

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Across
  1. 5. tools to help you with a sport or job
  2. 6. a body part near your neck
  3. 7. hundreds or thousands of years old
  4. 11. people who studied history, physics, and science
  5. 12. precious or worth a lot of money
  6. 15. not easily found or seen
  7. 16. the name of the man the hikers found
  8. 17. when the body recovers from sickness or hurt, it is ________.
  9. 18. A skeleton's head
  10. 19. not long ago
Down
  1. 1. when the answer to a question is shown to you
  2. 2. far away
  3. 3. discoveries
  4. 4. something no one knows
  5. 8. People who explore nature for fun
  6. 9. scars, bruises, cuts, or broken bones
  7. 10. get away from danger or trouble
  8. 13. an idea to explain an answer
  9. 14. a brown metal