Difference between discovery and invention

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Across
  1. 4. -something that exists and can be seen
  2. 6. -actractive force of the Earth
Down
  1. 1. -to make up or fabricate something
  2. 2. -To get knowledge of something
  3. 3. - Edison's invenction
  4. 5. - The man, who had discovered the gravitation force