World's greatest explosions

Compared to Yellowstone's past, Mount St. Helens was a picnic, when it covered Washington state with an ash bed about the size of Lake Michigan in 1980. Mount Pinatubo, which exploded in the Philippines in 1991, doesn't begin to scratch the surface of Yellowstone's roar. Nor did Krakatoa in 1883, which killed thousands, and the final explosion of which reportedly ruptured the eardrums of people 40 miles away.