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I was reading the article and I noticed that there is no clear explanation for how tuff is made. I assumed that it comes fully formed from the volcano, but I get the idea that it is volcanic ash that coalesces through the eons in the slopes of the volcanoes. Could someone make a section in the article explaining how tuff comes into being? Even if there is more than one way to make the tuff it would be a nice introduction to the subject for someone who does not know much about vulcanology.