火山灰

1. Origins, structure, and basic meaning

• Structure: 火山灰, read かざんばい, denotes fine material ejected by a volcano and deposited on the ground or in strata.
• Basic usage: It names volcanic material represented by powder in a model and preserved in strata for collection and study.

2. Common pitfalls and similar expressions

• Ejected volcanic material, not ordinary ash
  • It is fine material ejected by volcanic activity, not ash left by ordinary burning.