1. Absorption
  2. aerobic bacteria
  3. aerosols
  4. anaerobic bacteria
  5. anemometer:
  6. angle of insolation:
  7. aphelion:
  8. arid climate:
  9. atmosphere:
  10. axis:
  11. backwash:
  12. banding:
  13. barometer:
  14. . barycenter:
  15. . base flow:
  16. bedrock:
  17. . bench mark:
  18. biocide:
  19. biological pollutant:

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