Across
- 4. the portion of animals that are caught in a net and then thrown away as unwanted.
- 6. the movement of water from the surface to greater depths.
- 9. the vertical movement of deep water up to the surface.
- 10. a property of matter representing the mass per unit volume.
- 13. a shoreline area where fresh water from a river mixes with salt water from the ocean.
- 14. the overall direction and movement of water as waves strike the shore at an angle.
- 15. an opening in the sea floor from which heated water rises and mixes with the ocean water above.
- 17. a wet, swampy area that is often flooded with water.
- 20. a system that uses underwater sound waves to measure distance and locate objects.
- 21. a disturbance of wind patterns and ocean currents in the Pacific ocean that cause temporary climate changes in many parts of the world.
- 22. microscopic floating organisms that live in water and, like plants, convert sunlight and carbon dioxide into food.
Down
- 1. a narrow stream of water that breaks through sandbars and drains rapidly back into deeper water.
- 2. the measure of the amount of dissolved salt contained in water.
- 3. a mass of moving ocean water.
- 5. the flat or gently sloping land that lies submerged around the edges of a continent and that extends from the shoreline out to the continental slope.
- 7. the natural environment in which a living thing gets all that it needs to live;examples include a desert, a coral reef, and freshwater lake.
- 8. the periodic rising and falling of the water level of the ocean due to the gravitational pulls of the moon and the Sun.
- 11. the catching of fish at a faster rate than they can reproduce.
- 12. a large community of kelp, a type of seaweed that can attach to the ocean floor.
- 16. the narrow ocean margin between the high-tide mark and the low-tide mark.
- 18. the difference in height between high tide and low tide.
- 19. a built-up limestone deposit formed by small ant-sized organisms called corals.