Water Pollution

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Across
  1. 2. -a member of a large group of unicellular microorganisms which have cell walls but lack organelles
  2. 4. -excessive richness of nutrients in a lake or other body of water
  3. 7. -a substance used for destroying insects or other organisms
  4. 9. -the action or power of focusing one's attention or mental effort.
  5. 11. a substance that provides nourishment essential for growth
  6. 12. -a particular kind of matter with uniform properties.
Down
  1. 1. -the area of land where all of the water that drains off
  2. 3. -an organism that lives in or on an organism of another species
  3. 5. -the action or state of making or being made
  4. 6. -a synthetic material made from a wide range of organic polymers such as polyethylene
  5. 8. -an infective agent that typically consists of a nucleic acid molecule in a protein coat
  6. 10. -a salt or ester of nitric acid,