Geraldine's puzzle

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Across
  1. 4. a higher position
  2. 6. occurring or following in time or order
  3. 7. sudden and disastrous
  4. 8. calculations that are determined by using mathematics
Down
  1. 1. out of date and no longer used
  2. 2. purpose
  3. 3. iron, steel, and other metal objects towards it
  4. 5. putting something to use