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Across
  1. 5. the top or highest point of a mountain
  2. 7. when you control something from a distance
  3. 8. when living things grow well and are healthy
  4. 9. something that can go or work under water
Down
  1. 1. very old, from a time before history was recorded
  2. 2. a very quick look at something
  3. 3. needed or very important
  4. 4. when something controls itself
  5. 6. a long, narrow groove or ditch