Water Quality Crossword Puzzle

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Across
  1. 4. A large inland area of water, often surrounded by land.
  2. 5. The practice of farming crops and animals.
  3. 7. Mussel A small striped shellfish that can affect freshwater ecosystems.
  4. 9. A community of living things and their environment working together
  5. 10. Farm animals such as cows and sheep.
Down
  1. 1. An animal without a backbone, often used to test water quality.
  2. 2. A simple water organism that can grow rapidly during a bloom.
  3. 3. Substances needed for growth that can cause problems when too many enter water
  4. 6. A poisonous substance that can harm living things.
  5. 8. A nutrient that can enter waterways from fertilisers and cause algae growth.