Air

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Across
  1. 3. This causes respiratory problems among other diseases.
  2. 4. Air has a lot of these components.
  3. 7. We breathe out this gas.
Down
  1. 1. Vegetation gives us oxygen.
  2. 2. Factories and car release this gas.
  3. 5. Most of the earth is covered with this gas.
  4. 6. If we touch this, we might get burnt.
  5. 8. The air is full of this, and sometimes it is polluted.