The man who named the clouds

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Across
  1. 4. a short piece of writing
  2. 5. the hard piece that covers animals like fish
  3. 6. group of people with a common interest
  4. 7. a substance formed by other substances acting on each other
  5. 8. gas that surrounds Earth
Down
  1. 1. a person who works with an expert to learn a job
  2. 2. the force of one thing pushing against another
  3. 3. making goods by hand or machine