HEALTHY ENVIRONMENT

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Across
  1. 2. Not throwing everything.
  2. 4. It is a mixture of solid partículas.
  3. 7. It comes from factories.
Down
  1. 1. Mains kinds of water pollution.
  2. 3. One of the key factors of recycling.
  3. 5. Make something smaller.
  4. 6. Give off nitrogen oxides.