in which national park would you find the geyser known as old faithful?
Yellowstone National Park
Old Faithful is the most famous of the nearly 500 geysers in Yellowstone. It was named in 1870 by the Washburn-Langford-Doane Expedition. During their stay in the area, the members of the expedition noticed that Old Faithful erupted at regular intervals, thus leading to its name.
Geyser activity, like all hot spring activity, is caused by surface water gradually seeping down through the ground until it meets rock heated by magma. The geothermally heated water then rises back toward the surface by convection through porous and fractured rocks.
For at least the past 135 years, Old Faithful has reliably spewed bursts of steam and hot water every 50 to 90 minutes (the frequency has recently hovered around every 91 minutes), to the wonder of tourists. More than 100,000 eruptions of the geyser have been recorded.
How hot is the water in Old Faithful? During an eruption, the water temperature at the vent has been measured at 204°F (95.6°C). The steam temperature has been measured above 350°F!