Yellowstone volcano: How seven-year USGS study showed 'abnormal' change YELLOWSTONE volcano scientists, alongside the help of the European Space Agency , found the caldera had fluctuated in height by up to 120 millimetres, unearthed reports reveal. Share: Facebook Twitter Google+ Stumble Digg Email ThisBlogThis!Share to XShare to Facebook Related Posts:Trilobites: Just a Few Pieces of Plastic Can Kill Sea TurtlesWorm found in rubbish tip will be blasted into SPACE in UK's first experiment at ISSInternational Space Station LEAK: NASA and Russia remain tight-lipped over findingsTrilobites: Watch Plants Light Up When They Get AttackedU.S., Russia Respond to Space Station Leak RumorsRemember the Bees That Swarmed Times Square? We Tried to Find Out Where They Came From