What is the difference between oceans and seas because they look exactly the same?

Question: What is the difference between oceans and seas because they look exactly the same?
- Keywords:
  ocean,
  sea
Asked by 672tund47 to Gemma, Aimee, Hussain, Robert, Ross on 11 Nov 2015.
- Gemma Cripps answered on 11 Nov 2015:
  
  Hi 672tund47,
  
  A sea is part of the ocean that is partially enclosed by land. In other words, seas are smaller than oceans and are usually found where the land and ocean meet.

Question: What is the difference between oceans and seas because they look exactly the same?