Marine life

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Across
  1. 1. over 70% of our planets _____ is produced by the ocean
  2. 6. we still only know a fraction of the marine ____ in our oceans.
  3. 8. the worlds largest ____ chain is underwater. older sponges are _____ than dinosaurs.
Down
  1. 1. ____ cover more than 70% of the earths surface.
  2. 2. the majority of life on ___ is aquatic.
  3. 3. its possible to find rivers, and ____ beneath the ocean.
  4. 4. oceans contain 99% of the _____ space on the planet.
  5. 5. whales make the loudest ____ underwater.
  6. 7. less than 5% of the _____ oceans have been explored.