Disclaimer: I'm no Danish teaching expert, I just happen to be an Icelander who was forced to learn Danish as my second language - and although I always got very good grades in Danish, I was never good in Danish: can't speak it, can't understand a Dane - I can maybe read it a little bit...
University of Utah geology and geophysics professor Fan-Chi Lin said the blob-shaped lower magma reservoir in Earth's lower crust is located 12 to 28 miles (20-45 km) under Yellowstone, with a volume of 11,500 cubic miles (46,000 cubic km), or 11.2 times the volume of Arizona's Grand Canyon.
Two Yellowstone geysers, Excelsior Geyser in Midway Basin and Sapphire Pool Geyser in Biscuit Basin, have also produced eruptions that exceeded 300 feet. Excelsior was active between 1878 and 1888. Sapphire Pool erupted after the Hebgen Lake earthquake in 1959 and erupted periodically for a few years.