Recent satellite pictures of Yellowstone National Park in Wyoming from 2004 through 2006 are showing that an ancient volcano is starting to rise once again. Molten rock is currently pushing up the remains of the volcano's caldera, which sits over the top of Yellowstone lake, but scientists are stressing that there is no immediate threat of an eruption or explosion. The molten rock field is estimated to be the size of the city of Los Angeles, California.
There is a volcano in Yellowstone.