Unit 4: Ocean Life Zones and Primary Productivity

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Across
  1. 6. the process by which plants use sunlight and chlorophyll to convert carbon dioxide and water into simple carbohydrates and oxygen.
  2. 9. a fissure in the ocean floor from which mineral-rich, super heated water.
  3. 10. small floating organisms in the sea.
  4. 12. the ability of some organisms to create food from chemical reactions rather than from sunlight.
  5. 13. extends from 4000 meters to 6000 meters. The water temperature is near freezing, and there is no light at all. Three-quarters of the ocean floor lies within this zone.
Down
  1. 1. extends from 200 meters to 1000 meters.Sometimes referred to as the twilight zone.
  2. 2. all living organisms, including plants and animals of a given community along with the non-living physical environment.
  3. 3. water portion of the ocean.
  4. 4. organisms that can swim freely
  5. 5. the feeding position in a food chain;most food webs are made up of four trophic levels, from the plants that make their own food at the bottom level to the animals that eat other animals at the top level in a food chain.
  6. 7. an autotrophic organism(as a green plant)viewed as a source of biomass that can be consumed by other organisms.
  7. 8. pertaining to the ocean floor
  8. 11. microscopic aquatic animals