Marine science is the study of the ocean and its physical, chemical, biological, and geologic properties. It’s a vast field that encompasses many disciplines,

Oceanography
The study of the Earth’s oceans, including their physical properties, temperature, salinity, currents, and chemistry.
Marine Biology
The study of living organisms in the ocean, including animals, plants, fungi, and microorganisms.
Chemistry/Physics
The study of the chemical composition of seawater and the interactions between substances in the ocean
The study of the physical laws that govern the behavior of water and other fluids in the ocean.
Geology
The study of the Earth’s geological history, including the formation of coastlines, ocean basins, and marine sediments.