Ocean

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Across
  1. 2. also known as the trenches
  2. 7. this is the phenomenon in which things travelling in straight lines appear to be moving in curved lines
  3. 9. in this zone there is no sunlight 1000m+ below the surface
  4. 10. zone also known as the twilight zone
Down
  1. 1. this zone of the ocean is where all the photosynthesis occurs
  2. 3. this zone is 'bottomless' and reaches to about 6000m
  3. 4. movement of water in one general direction
  4. 5. sends sound waves to the ocean floor and waits for the echo
  5. 6. 99% of this is contained in the ocean
  6. 8. this trench is the world's deepest canyon