This is the 9110th most frequent Japanese word.
火山
Volcano.
The word '火山' means 'volcano' and is used here to describe natural geological formations characterized by activity.
日本には多くの活火山があります。
There are many active volcanoes in Japan.
The word '火山' refers to 'volcano,' contextualizing the origin of an eruption causing damage.
最近の火山の噴火は、大きな被害をもたらしました。
The recent volcanic eruption caused significant damage.
In this essence, '火山' represents the subject of the study, which is activities related to volcanoes.