The Water Planet

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Across
  1. 5. Long narrow depression located in the deep-ocean basin
  2. 7. Shallow parts of the ocean floor
  3. 8. Flat areas of the deep-ocean basin where the ocean is more than 4 km deep
  4. 9. system that uses acoustic signals and return echoes to determine location of objects
Down
  1. 1. The Deep part of the ocean beyond the continental margin
  2. 2. cylinders of sediment that are collected by drilling into sediment layers on the ocean floor
  3. 3. Body of water that is smaller than an ocean partially surrounded by land
  4. 4. Potato-shaped lumps of mineral deposits
  5. 6. Body of salt water that that covers 3/4th of the Earth's surface
  6. 10. Study of the characteristics, chemical composition, and life-forms of the ocean