Marine Ecosystems

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Across
  1. 2. very long-period waves that move through the ocean in response to the forces exerted by the moon and sun.
  2. 6. a shrub or tree that grows in coastal saline or brackish water.
  3. 7. a reduction in the pH of the ocean over an extended period of time, caused primarily by uptake of carbon dioxide (CO2) from the atmosphere.
Down
  1. 1. zone that lies 200 to 1,000 meters (about 650 to 3,300 feet) below the ocean surface, just beyond the reach of sunlight.
  2. 3. the tidal mouth of a large river, where the tide meets the stream
  3. 4. the uppermost layer of a body of water that receives sunlight
  4. 5. any type of a close and long-term biological interaction between two biological organisms of different species