Yellowstone National Park, located in Idaho, Montana, and Wyoming, was established as the first national park in the United States. The park is a popular destination for visitors who enjoy ecological (生态的) tourism as it offers forests, mountains, and many ecosystems to explore. Some of Yellowstone's most well-known landmarks are its geothermal (地热的) hot springs and geysers (间歇泉), the most famous of which is named Old Faithful.
Last fall, Lisa and her friends decided to take a camping trip to Yellowstone National Park. They arranged to stay at one of the park's many convenient campsites. For their camping trip, they brought their backpacks, sleeping bags, and a cooler of food and drinks. They set up their tents immediately upon arriving at their campsite.
During their trip, Lisa and her friends hiked the many trails (小道) of the park, exploring its natural surroundings. In the forest, they saw a lot of local wildlife. Lisa was blown away by a family of grizzly bears, some gray wolves, and even bald eagles flying overhead. Unexpectedly, she seemed to quite enjoy being in such a great place. They were well protected. Outside of the woods, they admired the beauty of some of Yellowstone's natural waterfalls.
Since Yellowstone contains many hot springs and the world's largest area of active geysers, Lisa and her friends visited many different geyser sites. They even spent an afternoon swimming in Yellowstone's Boiling River. Of all of the sites, Lisa and her friends agreed that Old Faithful was the most impressive. Lisa and her friends waited patiently for the geyser to erupt. After about 40 minutes, a stream of hot water over 100 feet tall sprayed ( 喷洒) from the ground and up into the air. Luckily, no one got wet!
