噴火口

1. Origins, structure, and basic meaning

• Structure: 噴火口, read ふんかこう, is the volcanic opening or crater from which lava, ash, or gases erupt.
• Basic usage: Visitors may be warned away from its surroundings, and a model may demonstrate how the crater forms.

2. Common pitfalls and similar expressions

• The opening of a volcano
  • This is the volcanic crater whose surroundings may be off limits and whose formation is shown with a model. The landform is distinct from the eruption event itself.