Basics......

Marine science is is a combination of biology, geology, physics and chemistry....infact it gives a chance to a student , to think from all fields of science .

Of course specialization is required to go deeper in the field of research...wherein u have a plus point of being aware of the other parameters which could affect the parameter u r specializing or doing research in.

Marine biology includes marine productivity (production of inorganic carbon from organic matter through photosynthesis /chemosynthesis )studies, measurement of primary productivity , by C14 method/chlorophyll estimation, fish identification (species level)...anatomy, study of corals, mangrove studies/identification , population ecology......current research topics, economically important fishes.....But it is not just fishes we also study phytoplankton , zoo-plankton, bacteria ,marine algae , higher marine mammals and reptiles too .

Physical oceanography includes all physical parameters like climate ,physical properties of water, remote sensing, monsoon ,types of radiations , electromagnetic spectrum, physical aspects of ocean , estuaries
physical processes in oceans, water masses , current patterns , waves ...

Marine geology includes earth magnetism, processes on beach , formation of universe..age of the earth , planets, geochemistry, plate tectonics and a lot more interesting things...

Marine chemistry is all about chemical properties of water ,marine corrosion , Major and micro nutrients in da ocean, different elements /compounds..dissolved gases..Marine corrosion ,fouling, thermodynamics derivations etc..

This is what marine science is in brief ... beautiful combination of all sciences......