Easy

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Across
  1. 6. a person filled with excessive and single-minded zeal, especially for an extreme religious or political cause.
  2. 7. Helping to restore to good condition.
  3. 8. a person who looks after the passengers on a ship, aircraft, or train and brings them meals.
  4. 9. The action of reducing the severity, seriousness, or painfulness of something.
Down
  1. 1. Means having many sides or aspects. Expansive Means covering a wide area in terms of space or scope; extensive or wide ranging.
  2. 2. The process by which once fertile soil turns into unusable and barren soil, and dry.
  3. 3. The action of remedying something, in particular of reversing or stopping environmental damage.
  4. 4. of,at, or near the equator.
  5. 5. an event causing great and often sudden damage or suffering; a disaster.