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Across 1. breakdown of a substance 4. dead plants or fertilisers that provide food for algae 7. plant nutrient (plant food) in fertiliser 9. agricultural / Farm Pollution 11. plant nutrient(plant food) in fertilisers 13. when algae receive too many nutrients and grow very rapidly 14. small plant like organisms that use photosynthesis to survive 15. liquid fertiliser made from cattle faeces and urine

Down 2. too much 'good food' is added to a river or lake killing fish 3. when a substance is found within water (like sugar in a cup of tea) 5. water that flows from mountains to sea 6. manmade plant food applied to crops 8. these organisms breakdown dead algae and remove dissolved oxygen from water at the same time 10. vegetation produces material that enters a lake 12. fish rely on this dissolved substance in water