地殻

1. Origins, structure, and basic meaning

• Structure: 地殻 is read as ちかく and means “Earth's crust”.
• Basic usage: It names Earth’s crust in a classroom model and the oceanic and continental crust distinguished in a diagram.

2. Common pitfalls and similar expressions

• 地球の地殻 / 海洋の地殻
  • Use 地球の地殻 for the whole and 海洋の地殻 or 大陸の地殻 for specific types.