Yellowstone National Park is a great place to visit on a family vacation. According to the National Park Service online, Yellowstone was the first national park in the United States in 1872. It sits on top of an active volcano called a caldera. Lava created its terrain. Up to three-thousand earthquakes happen each year. Those quakes fracture the earth’s surface and make possible its famous geyers.

“They were really cool. They shot straight up into the air, over 100 feet tall. It was amazing to see!” Tatum McClain, a sightseet at the park, said.

A geyser is a fracture in the earth where ground water is warmed by hot magma inside the Earth’s core, states the National Park Service online. The most famous geyser in the world is called Old Faithful. It was named that because its eruptions are so reliable. They used to be every hour, and now they’re every hour and a half. There are more than five-hundred geyers at Yellowstone, according to one national park tour guide.