Ocean Literacy is a term nominated a few years ago to attempt to describe what people need to know about the sea, in particular teachers and students. As a US designed education project it has a perspective based on education principles in the USA however there has been a real effort to have a balanced yet comprehensive outline for anyone. It is presented on the College of Exploration website
Topics start with several knowledge areas then unfold into stepped themes for each age level. Never mind teaching the kids, it's even great for teachers and the community to understand better how the ocean is so connected to us and to all we do
Here you can not only find a dissection of what you need to know and teach about the sea but discover utube gems like Dr Sylvia Earle's clip on our own Great Barrier Reef and several other really interesting shorts about science and the sea.