Time capsules - vocabulary

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Across
  1. 4. (n) a period of 10 years
  2. 6. (n) A small object kept to remember someone or something special."
  3. 8. (adj)Discovered something buried or hidden.
  4. 11. (v) To find something for the first time.
  5. 15. (n) a thing that is left behind for the future.
  6. 16. (n) something valuable, often hidden.
  7. 18. (v) To dig something up or discover something hidden."
  8. 19. (n) A message left for future people to find
  9. 21. (n) An object kept as a reminder of a person, place, or event (it comes from French)
Down
  1. 1. (n) The act of keeping something safe or secret for a long time
  2. 2. (n) The ability to remember information or past events
  3. 3. (v) To put something where no one can see it
  4. 5. (n)the opposite of past.
  5. 7. (adj) Covered by earth or hidden under something.
  6. 9. (adj) it cannot be seen.
  7. 10. (v) To break up or move earth with tools
  8. 12. (n) A period of 100 years.
  9. 13. complete the sentence with the correct modal: “The time capsule …. be unearthed in 50 years”
  10. 14. (v) To put something underground.
  11. 17. (adj) Something that is worth a lot or is important (clue: noun+able ."
  12. 20. (v)To uncover or find something buried in the ground.