Geysers are rare phenomena and only happen where the conditions are right. Most geysers are located in volcanic areas and they are caused when water flows down through the ground and comes in contact with very hot rocks. The boiling water and steam then shoot out of the ground creating a geyser. Old Faithful, named for the consistency of its eruptions, is probably the most famous. But it's only one of hundreds of geysers in Yellowstone National Park, Wyoming. And there are nearly a thousand…