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