岩塊

1. Origins, structure, and basic meaning

• Structure: 岩塊 is read as がんかい; it combines 岩 (rock) and 塊 (mass) to mean a boulder or distinct mass of rock.
• Basic usage: Use 大きな岩塊が転がっている for its presence and 岩塊の表面 for the surface under examination.

2. Common pitfalls and similar expressions

• Emphasis beyond 岩
  • Rather than naming rock material or terrain broadly, it focuses on a bounded, substantial mass.
• Whole and surface
  • The survey team’s photograph concerns the surface being examined, not merely the boulder’s location.