Aquatic Science Review 2/3

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Across
  1. 3. Lakes rich in nutrients, often due to human activities, leading to excessive plant growth, oxygen depletion, and reduced biodiversity.
  2. 6. A lake with low nutrient levels, leading to low biodiversity and clear waters.
  3. 8. The lowest level of a body of water, including the sediment surface and some organisms living at the bottom.
  4. 9. The sunlit upper layer of a water body where photosynthesis can occur.
  5. 13. Animals without a backbone that are visible to the naked eye.
  6. 14. The open, well-lit surface area of a lake, away from the shore, where photosynthesis occurs and plankton thrive.
  7. 17. The region of a lake or ocean near the shore where sunlight penetrates, supporting high levels of plant and animal life.
  8. 19. Systems formed by the interaction of a community of organisms with their environment.
  9. 21. Areas saturated by water where various plants and animals thrive.
  10. 22. Pollution that comes from an unknown or diffuse source, such as runoff from various human activities.
  11. 23. Measure of water clarity and the presence of sediments.
Down
  1. 1. Water with a low salt concentration, typically less than 0.5 parts per thousand (ppt).
  2. 2. Water that has a moderate concentration of salt, measuring between 0.5 and 30 parts per thousand (ppt).
  3. 4. The deep, dark area of a lake where sunlight does not penetrate, resulting in low oxygen levels and minimal plant life.
  4. 5. The emission of light by living organisms, often found in deep, dark oceanic zones.
  5. 7. Pollution originating from a single identifiable source, like pipes, factories, or sewage treatment plants.
  6. 10. The deeper, darker layer of a water body where sunlight cannot penetrate.
  7. 11. Relating to the sea or saltwater environments with a salt concentration above 30 parts per thousand (ppt).
  8. 12. A land area that drains into a stream or another body of water, acting like a funnel.
  9. 15. Lakes with moderate nutrient levels, relatively clear waters, and higher biological productivity compared to oligotrophic lakes.
  10. 16. All flowing natural waters; typically, "river" refers to a large stream.
  11. 18. The degree of hotness or coldness of water.
  12. 20. The concentration of dissolved salts in water.