the ocean composes most of the planets hydrosphere 
I knew it was a lot - the oceans are still so unexplored
97 % of the world is water, it will take many more years to find everything , i bet theres many undiscoverd fish in there
I'm sure there are - it's just so undiscovered.  I wouldn't be surprised to find one of those Megaladons one of these days.
so far they have only discovered 230,000 species , they believe there is 2 million undiscovered species 
Or more! It's just so fascinating to me - at one point my daughter wanted to be a marine biologist - I would have loved that career.
all the areas in the ocean are pacific, atlantic, artic and pacific
Aren't there seas as well that are salt-water but aren't considered oceans?
the earths hydrosphere for part of the carbon cycle, and influence climate and weather patters
I wonder if the earth used to be the same way say just 10,000 years ago.