Easy Onset Puzzle #2

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Across
  1. 1. a large semiaquatic reptile similar to a crocodile
  2. 4. a hypothetical or fictional being from another world
  3. 5. the joint between the forearm and the upper arm
  4. 6. a flat paper container with a sealable flap
Down
  1. 2. similar in every detail; exactly alike
  2. 3. a mythical animal typically represented as a horse with a single straight horn projecting from its forehead
  3. 6. equivalent to the product of two and four; one more than seven