Coal doesn't burn completely. Here's what's left over.
(Do I apologize for the weak blogging? No! No apologies! I am still trying to work "elusive", "obsequious", and "vapid" into a discussion of bedrock hydrogeology. "Propinquitous", though, that's taken care of. Also, I am contemplating cheesy steganography.)
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Aw, there are prettier pictures of slag than that!
Pretty slag pics and more pretty slag pics
Oooh, those are pretty!
I think that's a pretty neat picture of the old smelting or furnace building -or whatever old building that is- and the huge hill of slag around it.