chemistry

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Across
  1. 3. A renewable energy source produced by the breakdown of organic matter
  2. 7. Microorganisms that require oxygen to grow.
  3. 8. Waste matter carried away in sewers or drains.
  4. 10. Microorganisms that do not require oxygen to grow.
  5. 11. Measures for ensuring cleanliness and preventing disease.
Down
  1. 1. A thick, soft, wet mud or a similar viscous mixture of liquid and solid components.
  2. 2. Microorganisms that do not require oxygen to grow
  3. 4. A renewable energy source produced by the breakdown of organic matter.
  4. 5. Water that has been affected by human use
  5. 6. The process of introducing air into a material.
  6. 9. A substance that makes something impure or unsuitable