I think it is completely sufficient to mark the volcanoes as active, as it is already done.

Completely agree to what danieldegroot2 wrote. I don't see the need for such a tag

And please provide a source

Could you please make sure that you do not connect things that don't have anything to do with each other, for example the landcover and the path to Geldingadalir. This is 1. not correct and 2. makes it very annoying to edit these objects.

Please make sure that you do not accidentally destroy data! A lake with two ways both with role=inner does not make any sense!

There were broken multipolygons as the Geldingadalir multipolygon with invalid roles.

Thanks for the hint. I corrected it

It should be CLC:code=311
I accidentially edited it.

I know, I realised too late that I was not longer in Germany... ;-)

Ok Sorry, edited everything