溶岩 ようがん円頂 えんちょう きゅうではありませんでした
yōgan'enchōkyūdewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 溶岩円頂丘

1. Was not a lava dome.; Was not a lava mound.

Past/Perfective
Negative
Polite
Formal Register