Question

I need a short speech on why oceanography is important to the Earth.

Answer 1

First, start by defining what oceanography is.
So provide a definition or something about your understanding on what oceanography is and the different types. Then link it back to Earth (maybe refer to current issues- global warming, climate change etc ???)

Some helpful links you might want to read :)
http://oceanservice.noaa.gov/facts/oceanographer.html

http://www.marinecareers.net/oceanography