発散 はっさん がた境界 きょうかいではありませんでした
hassanga takyōkaidewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 発散型境界

1. Was not a diverging boundary.; Was not a spreading boundary.

Past/Perfective
Negative
Polite
Formal Register
Geology