Yellowstone closes Biscuit Basin for the season after hydrothermal explosion  NBC NewsYellowstone eruption blasts debris into sky near Old Faithful geyser  BBC.comA baffling, dangerous explosion in Yellowstone: What is a hydrothermal explosion?  USA TODAYYellowstone, USGS release more details about Biscuit Basin hydrothermal explosion  KBZK NewsYellowstone Park Officials Conclude Cause Of Explosion  The Weather Channel