Nature

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Across
  1. 1. System of exchanging goods without money
  2. 5. Domain of water
  3. 6. Surrounding of any living organism
  4. 7. System formed by interaction of all living organisms
Down
  1. 2. Thin Layer of air surrounding the earth
  2. 3. Solid crust of Earth
  3. 4. The world of living organisms