The Loch Ness Monster. Fact or Fiction?

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Across
  1. 2. Make something (often undesirable) continue indefinitely.
  2. 3. An animal whose existence is unproven, often subject of folklore.
  3. 5. A humorous or malicious deception.
  4. 6. Perceptible by touch; real or definite.
  5. 7. Tendency to perceive meaningful images in random patterns.
  6. 8. The traditional beliefs, customs, and stories of a community.
  7. 9. A person inclined to question or doubt accepted opinions.
  8. 13. Technology using sound propagation to navigate or detect objects underwater.
  9. 14. Unclear or open to more than one interpretation.
  10. 17. Difficult to find, catch, or achieve.
  11. 18. Available facts or information indicating whether a belief is true.
Down
  1. 1. Critical observation or close examination.
  2. 2. Seeming reasonable or probable.
  3. 4. Exposed the falseness or hollowness of a claim.
  4. 7. Extinct long-necked marine reptile often compared to Nessie.
  5. 10. Powerfully attention-grabbing or convincing.
  6. 11. (Of a habit or belief) firmly fixed or established.
  7. 12. An animal, as distinct from a human being.
  8. 15. Something that is difficult or impossible to understand or explain.
  9. 16. A traditional story sometimes popularly regarded as historical but unauthenticated.