1.
volcano
A mountain or hill with an opening through which lava, ash, and gases are or have been erupted.
Usage: Japan is one of the most volcanically active countries, with over 100 active volcanoes.
Types
Related words
Famous japanese volcanoes: 富士山, 桜島, 阿蘇山
Related Words
Related:
噴火 (eruption)
Related:
火口 (crater)
Related:
溶岩 (lava)
Related:
温泉 (hot spring)
Related:
マグマ (magma)
Compare:
噴火口 (volcanic crater)
Related:
火口原 (caldera floor)