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1、 lYellowstone National Park, set aside by the U.S. Congress as a national park on March 1, 1872, is located mostly in the U.S. state of Wyoming（美国怀俄明州） , though it also extends into Montana）蒙大 纳（美国州名） and Idaho（爱达荷) . The park was the first of its kind, and is known for its wildlife and its many geo
2、thermal（地热的） features, especially Old Faithful Geyser(喷泉), one of the most popular areas in the park. It has many types of ecosystems, but the subalpine（ 亚高山带） forest is dominant. Old Faithful shows that rocks below the surface are very hot. Rocks below ground heat the water under pressure for aroun
3、d 90 minutes. Suddenly, some water spurts through a tiny 5-inch wide crack in the rocks. This causes a drop in the pressure within the water chamber. In an instant, thousands of gallons of water are turned to steam and blasted up into the air.Paved roads provide close access to the major geothermal
4、areas as well as some of the lakes and waterfalls Yellowstone Lake is one of the largest high- altitude The caldera(火山喷口) is considered an active volcano ,it has erupted with tremendous force several times in the last two million years Grizzlies, wolves, and free-ranging herds of bison and elk live in the park.Yellowstone has numerous recreational opportunities, including hiking, camping, boating, fishing and sightseeing.
