Scientific innovation

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Across
  1. 2. the opposite of "to empty"
  2. 4. to put aside
  3. 7. the opposite of dirty
  4. 8. synonym of discovery
  5. 10. to make something unclean
  6. 11. that can be used again
Down
  1. 1. the world around us
  2. 3. advancement towards something better
  3. 5. the act of calling for protection of the environment
  4. 6. the most useful liquid
  5. 9. you do it , to make tea