溶岩 ようがん円頂 えんちょう おかじゃありませんでした
yōgan'enchō okaja arimasendeshita

Noun
Desu Copula

The polite, past negative form of 溶岩円頂丘

1. Was not a lava dome.; Wasn't a lava dome.

Past/Perfective
Negative
Polite
Terminal Form