海洋

1. Origins, structure, and basic meaning

• Structure: 海洋 is read かいよう and refers to the ocean.
• Basic usage: It often appears in research or descriptive contexts, as in 海洋研究 and 海洋の生態系.

2. Common pitfalls and similar expressions

• Relation to 海
  • 海 is the broad everyday word for the sea; 海洋 suits more formal discussions such as research and the environment.