And when they do it's a big deal if you're nearby. You have to avoid the temptation to run and turn around and watch what comes up and out of them so you don't get hit by it. They spit out bits of molten lava that quickly harden into light rocks. Sometimes these rocks have lots of holes in them like a sponge.
In this picture I'm in a special volcano lab holding one of these burped rocks.
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