The mountain and its ranges is entirely of volcanic origin.

Rock samples indicate volcanic origins going back to at least 8.8 million years.

Similar to the other hills in the area, it is of volcanic origin.

"Its volcanic origins can be seen all over the island," Hammond said.

The red soil found in the valley is of volcanic origin.

Some are high in the mountains and have volcanic origins.

The island has a prominent mountain system of volcanic origin.

The volcanic origin of the islands in the lake is clearly visible.

It can be found in the mountain peaks of volcanic origin.

The other islands of the group have a volcanic origin.