I use these notes in my 12th grade Marine biology class as a short Oceanography unit. It is a semester course, so this is a very quick Oceanography lesson. It includes features of the sea floor, Alfred Wegener's work on continental drift , discoveries on the ocean floor that led to the theory of plate tectonics, plate tectonics, waves, tides and currents, upwelling, light penetration, chemistry of seawater, biological factors, estuaries.
There are extra notes below each slide, adding to what you can talk about.
I have a free version which is a 6 slide per page version of the entire lecture in black and white. You can preview that first and decide if you want the powerpoint version.