The sea is actually stew, stew consists of a more thicker broth and rather more meats than soup, the ocean has an enormous sea life population and the salt water makes the ocean more thick, lakes and rivers would be considered soup
THE OCEAN IS A SOUP; ... yeah you're gonna need to explain that one. What's needed for a soup to be a soup? Well let's see. Water, salt, vegetables, maybe some meat- oh my god it's actually a soup