Two British researchers contend that a volcano violently eruptedaround2,000 years ago and blew a large hole through the ice sheet in WestAntarctic at around the year 207 B.C., and scientists confirmit was the largest volcanic eruption in Antarctica over the last 10,000years. The forceof its eruption threw a plume of debris (ash, dust, and othermaterials) into the atmosphere—they think it went about 7.5 miles, or12 kilometers high—which returned to Earth as a large elliptical-shapedlayer of debr