A Sound of Thunder - Vocabulary

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Across
  1. 4. requiring mental acuteness; difficult to understand
  2. 7. difficult to please; fussy
  3. 10. to destroy; wipe out
  4. 12. swarming; overflowing
  5. 13. not strictly necessary; can be sacrificed
  6. 14. major economic decline or crisis
  7. 15. cancel; withdraw
Down
  1. 1. below the level of awareness; subconscious
  2. 2. send back; return payment
  3. 3. too small to be measured
  4. 4. to become stale; cease to run or flow
  5. 5. able to return to its original form; elastic
  6. 6. extreme mental disturbance; seeing things that are not there
  7. 8. to shake tremulously; tremble
  8. 9. something that seems to have contradictory qualities; illogical
  9. 11. primitive; of the earlier times