Yellowstone is home to around 10,000 geothermal features and 500 of these are actually geysers. Yellowstone holds most of the world’s geo thermal energy. Most of the park sits in an old volcanic crater that was created thousands of years ago. There is still volcanic activity below the surface but most of the energy is released through the geysers and hot springs that are through out the park.

There are many different geysers in the park, but the most famous is Old Faithful. This geyser will erupt every 90 minutes though on occasion the time span can range from 45 to 125 minutes. There are benches set up for those who want to wait to watch the eruptions happen. This is the most popular because it is the most predictable and routinely erupts for spectators to see. Old Faithful can reach heights of around 100 ft during its eruptions. The eruptions can last from 1.5 to 5 minutes long.