Katla

https://www.independent.co.uk/news/w...-a8551981.html

Our sister planet Venus has a substantially larger concentration of volcanoes than Earth while having no appreciable plate tectonics.

https://en.wikipedia.org/wiki/Volcanology_of_Venus

The similar sized Earth has a combination of plate tectonics and volcanoes hence the ability to compare planetary traits such as why Venus has a high atmospheric concentration of carbon dioxide or more importantly - why the Earth's rotation and specifically differential rotation of the fluid interior impacts the evolution of the surface crust.

An unmoderated newsgroups allows these speculative approaches to exist whereas it would be suffocated in another environment nevertheless it is all common sense and open for discussion among those who enjoy the challenge.