Hypothesis of Past Events

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Across
  1. 3. difficult or impossible to understand
  2. 7. a supposition or proposed explanation
  3. 8. a thing that is true
  4. 9. when something is a prank or joke
Down
  1. 1. a large, hairy, ape-like creature
  2. 2. an enormous mythical sea monster
  3. 3. an imaginary creature
  4. 4. when you see something unusual
  5. 5. something beyond scientific understanding or the laws of nature
  6. 6. a traditional story