Yellowstone National Park became America's first national park in 1872. The National Park Service was formed 44 years later in 1916. Yellowstone, which is mostly in the state of Wyoming, is considered as an example of the success of the National Park System. Humans have been present in Yellowstone for more than 11,000 years. Yellowstone contains beautiful mountains, deep canyons, lakes and rivers. The name Yellowstone comes from the river running through the area. At first known as Rock Yellow River, it became known as the Yellowstone River.
Yellowstone is host to many different species of plants. However, the park is most special because of a volcano, known as the Yellowstone Caldera. The caldera is 48 by 72 kilometers. And it remains an active volcano. It is believed that the last time the volcano erupted was one half million years ago. Yellowstone is filled with many hot springs. The most famous one is Old Faithful. It erupts about every hour or hour and a half. The eruption can last from one and a half minutes up to 5 minutes.
In addition to its beauty and wonder, Yellowstone is an animal sanctuary(避难所). It is home to the largest group of wild animals in the United States. As you travel through the park, you can sometimes see them in their natural habitat. There is still a wild west in America and its name is Yellowstone.
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