Okay, so this isn’t so much a fun science fact. It’s more of an amazing human activity. Recently, a friend clued me in to the very new extreme sport of volcano boarding. I couldn’t find any non-copyright-infringing photos of this, so try to imagine the girl above sliding down the Cerro Negro volcano in Nicaragua (picture on left) using only that sled/surfboard looking thing. Amazing, right?
The goggles and full body jumpsuit are necessary because that’s crushed up volcanic rock they’re surfing on. Volcanic rock is composed of quite a lot of silica (also known as glass). Like snowboarding on glass. I’m guessing it’s not too much fun if you wipeout, but it looks like a fun ride!
For more on the sport, including much better pictures, see this site: http://www.foxnews.com/travel/2013/06/27/seriously-hot-sport-volcano-boarding/