environment

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Across
  1. 5. a kind of sound that disturbs others
  2. 6. the mass of air surrounding the Earth
  3. 7. the substance that covers the earth's surface
  4. 9. the gas we need every second
  5. 10. air pollution that reduces visibility
Down
  1. 1. where plants grow
  2. 2. use sth more than once
  3. 3. prevent sth from destruction
  4. 4. let out large amount of polluted gas
  5. 8. the measurement of the air(有破折号)