The Biggest Waterfall on Earth is Hidden Under the Ocean

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Across
  1. 3. Very great or intense; having deep insight.
  2. 4. The concentration of dissolved salts in water.
  3. 6. So slight, gradual, or subtle as not to be seen or felt.
  4. 8. Violent or unsteady movement of air or water, or of some other fluid.
  5. 12. Deeply shocking or astonishing.
  6. 16. The junction of two rivers, or a situation in which two things come together.
  7. 17. A seemingly absurd or self-contradictory statement that may prove to be true.
  8. 19. The degree of compactness of a substance; its mass per unit volume.
  9. 20. A large, low-lying area, often below sea level, such as the floor of an ocean.
Down
  1. 1. Existing, occurring, or used under the surface of the sea.
  2. 2. A body of water or air moving in a definite direction.
  3. 5. Of or relating to the Earth or its inhabitants; living on or in the ground.
  4. 7. To fall or drop straight down at high speed.
  5. 9. A rising of seawater, magma, or other liquid.
  6. 10. A large waterfall.
  7. 11. Relating to or denoting the circulation of seawater caused by density differences resulting from variations in temperature and salt content.
  8. 13. The job of supervising or taking care of something important.
  9. 14. To draw in and transport (something, such as solid particles or gas) by the flow of a fluid.
  10. 15. Extremely large or great.
  11. 18. Relating to the depths of the ocean.