温おん泉せん余よ土ど

noun

solfataric clay

Technical geology term for clay formed in solfataric (volcanic fumarole) environments. Rare in everyday conversation.

• この地ち域いきの温おん泉せん余よ土どは、かつての火か山ざん活かつ動どうで形けい成せいされた。

  The solfataric clay in this area was formed by past volcanic activity.