熱水 ねっすい噴出 ふんしゅつ こうではありませんでした
ne' suifun shu tsukōdewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 熱水噴出孔

1. Was not a hot spring vent.; Was not a hydrothermal vent.

Past/Perfective
Negative
Polite
Formal Register