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Boyle's Law, Charles's Law, and Archimedes principle are the main principles. Study those and that should get you started.
Oceanography is like geography in the sea. You study the geography of the seabed and the nature of the water, such as salinity, turbidity currents etc. Although oceanographers may like scuba diving it is unlikely that is will be part of their job because using SCUBA you can only visit a tiny amount of the oceans. Lots of oceanographers are involved in oil exploration for example where the water would be far to deep to reach with scuba.
depth. going below 150 feet in scuba gear is extreamly hazardous to your health.
practice swimming, stop smoking, get in shape, read your study book before classes. First night you will do a swim test to see your ability to proceed with classes. Also a health questionaire will need to be filled out concerning any breathing concerns. Do not take scuba classes because someone wants you to. It must be Your decision and not someone elses. Most of my classes I taught had someone who was there because a loved one or friend wanted them to. Bad idea. Otherwise enjoy the incredible world out there before you underwater. Well worth the time, money and experience.
You have to study business policy if you wish to start your own business and join a new venture as partner or vice versa. Without knowing the knitty gritty of the business, your decision should be like diving into the river without knowing swimming.
Logically, for self contained underwater breathing. Zoologists are scientists too! and when they study animals under water, they need to breathe. SCUBA tanks are also used to charge certain air guns and cannons for ballistics testing and such.
You should study politics.
u should study science
you should study for a better education for a better future
You should study an organization in order to learn what it does.
You should indeed study medicine if that is your passion. If you do not like medicine do not study medicine.
A bathysphere is a spherical deep-diving chamber with perspex windows, in which people can be lowered by a cable to study oceans and deep sea life.