The Yellowstone National Park黄石公园.ppt

The Yellowstone National Park
Yellowstone National Park is a national park located primarily in the . state of Wyoming, although it also extends into Montana and Idaho. It was established by the . Congress and signed into law by President Ulysses S. Grant on March 1, 1872.
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 monly 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.
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. prise 80 percent of the land area of the park; most of the rest is grassland.
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).
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