Oceanography

Oceanography (also called oceanology or marine science) is the study of the ocean, its properties and its characteristics. This can include, and is not limited to, studying the marine life, the geography of the ocean floor, and the water itself. Many sciences are useful in oceanography, so it is a multidisciplinary field. Oceanographers spend much time on boats. 
 Sub-Categories 
The study of oceanography may be divide branches:
 Marine biology or biological oceanography
 Chemical oceanography or marine chemistry
 Marine geology or geological oceanography
 Physical oceanography
 Marine engineering