water crossword puzzle

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Across
  1. 5. currents that move and mix water around the world
  2. 7. mountain rising from the ocean floor
  3. 8. gently sloping shallow area that extends outward from the edge of each continent
  4. 12. long chains of mountains on the ocean floors producing new seafloor
Down
  1. 1. largest and most powerful surface current in the North Atlantic Ocean
  2. 2. long deep valley on the ocean floor where the old ocean floor sinks back into the mantle
  3. 3. currents rush of water flowing rapidly back to sea through a narrow opening
  4. 4. steep edge of a continental shelf
  5. 6. white-capped waves that crash onto the ocean floor with decreasing speed and changes in shape
  6. 9. currents affecting water to a depth of hundreds of meters driven by winds
  7. 10. wave caused by an earthquake beneath the ocean floor
  8. 11. broad area covered with thick layers of mud and silt