I’ve been to Rotorua.It’s famous for it’s sulfur stench due to volcanic activity.Smells pretty bad.
I’ve been to Rotorua also but recall the glaciers on the west coast of the South Island, not near Rotorua. Although the north did have an ice-covered volcano peak I could see from the train and might account for the northern glaciers. My trip was almost 30 years ago.
Gee, I would think that a land with volcanic activity might have some melting ice. I mean, does not the word volcano conjure up thoughts of warm, hot, hotter, molten lava is capable of melting ice?!