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There are all different textures, I guess it depends on what kind of gases and how big the bubbles were in the molten rock.

I could end up spending a whole day there.

We unexpectedly spent a whole week in this area. We were on our way to Arizona and we ended up having problems with the truck and it took that long to get the repairs done. So we got to do a lot of exploring, and I'm so glad we did.

I don't know how you say in English but in Hungarian we have a saying. There's a good thing in every bad thing. This is true in most cases.

That is a good way to say it in English, too. 'Every cloud has a silver lining' is an often used saying here.

Thank you Melinda, I have to look that up!