Freshwater Ecosystems

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Across
  1. 3. Deep, blue water with little nutrients and lots of oxygen
  2. 6. Another name for large aquatic plants
  3. 9. When water seeps beneath the soil layer
  4. 12. The organism that makes up algae
  5. 13. The water zone where light penetrates
  6. 15. Where the thermocline starts
  7. 17. A plant whose stalk is above the water line
  8. 18. When a lake has less oxygen, more algae, and is shallow
Down
  1. 1. The bottom most layer of the lake
  2. 2. When nutrients and oxygen are mixed due to the same temperature of water
  3. 4. Standing, still, freshwater
  4. 5. An area of rapid temperature change
  5. 7. When organisms use sun light and convert it into usable energy
  6. 8. Any type of photosynthesizing organism
  7. 10. One of the waste products of plants
  8. 11. An organism that has to eat to obtain energy
  9. 13. The water zone where light does not penetrate
  10. 14. The zone where light penetrates through open water
  11. 16. Well lit shallow zone of the epilimnion