The Yellowstone National Park黄石公园

Volcano

Yellowstone National Park spans an area of 3,468.4 square miles comprising lakes, canyons, rivers and mountain ranges. Yellowstone Lake is one of the largest high-elevation lakes in North America and is centered over the Yellowstone Caldera, the largest supervolcano on the continent. The caldera is considered an active volcano. It has erupted with tremendous force several times in the last two million years. Lava flows and rocks from volcanic eruptions cover most of the land area of Yellowstone.The park is the centerpiece of the Greater Yellowstone Ecosystem,the largest remaining nearlyintact ecosystem in the Earth's northern temperate zone.
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Lakes
Grand canyon
Grizzly bears
Free-ranging herds
Geography
1. Approximately 96 percent of the land area of Yellowstone National Park is located within the state of Wyoming. Another three percent is within Montana, with the remaining one percent in Idaho. The park is101 km north to south, and 87 km west to east by air. Rivers and lakes cover five percent of the land area, with the largest water body being Yellowstone Lake at 87,040 acres. Yellowstone Lake is the largest high altitude lake in North America. Forests comprise 80 percent of the land area of the park; most of the rest is grassland.

The park is the centerpiece of the Greater Yellowstone Ecosystem, the largest remaining nearly-intact ecosystem in the Earth's northern temperate zone.
The Yellowstone National Park
History Geography
Climate
History
The park is located at the headwaters of the Yellowstone River, from which it takes its historical name. Near the end of the 18th century, French trappers named the river "Roche Jaune". Later, American trappers rendered the French name in English as "Yellow Stone". Although it is commonly believed that the river was named for the yellow rocks seen in the Grand Canyon of the Yellowstone, the Native American name source is not clear.
Hundreds of species of mammals, birds, fish and reptiles have been documented, including several that are either endangered or threatened. The vast forests and grasslands also include unique species of plants. Yellowstone Park is the largest and most famous location in the Continental United States. Grizzly bears, wolves, and free-ranging herds of bison and elk live in the park.
The Yellowstone National Park
Yellowstone National Park is a national park located primarily in the U.S. state of Wyoming, although it also extends into Montana and Idaho. It was established by the U.S. Congress and signed into law by President Ulysses S. Grant on March 1, 1872.
Climate
1. Yellowstone climate is greatly influenced by altitude, with lower elevations generally found to be warmer year round. The record high temperature was 37°C in 2002, while the coldest temperature recorded is −54 °C in 1933. 2. Precipitation in Yellowstone is highly variable and ranges from 380 mm annually near Mammoth Hot Springs, to 2,000 mm in the southwestern sections of the park. The precipitation of Yellowstone is greatly influenced by the moisture channel formed by the Snake River Plain to the west that was, in turn, formed by Yellowstone itself. Snow is possible in any month of the year, with averages of 3,800 mm annually around Yellowstone Lake.
2 . Yellowstone National Park has one of the world's largest petrified forests, trees which were long ago buried by ash and soil and transformed from wood to mineral materials. 3. The park sits on the Yellowstone Plateau, at an average elevation of 8,000 feet (2,400 m) above sea level. 4. The most prominent summit on the Yellowstone Plateau is Mount Washburn at 10,243 feet (3,122 m).
Volcano

Yellowstone, widely held to be the first national park in the world, is known for its wildlife and its many geothermal features, especially Old Faithful Geyser, one of the most popular features in the park. It has many types of ecosystems, but the subalpine forest is most abundant. It is part of the South Central Rockies forests ecoregion.