Words part 1

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Across
  1. 3. for the reason that
  2. 6. free from noise
  3. 7. to pass again through a series of changes or temperature
Down
  1. 1. a region of earth having specified climatic conditions
  2. 2. application of force
  3. 4. the branch of math that works with variables
  4. 5. to pay atention to noise