yellowstone

The United States has about 59 national parks, but 10 of them are considered the most typical.

With a 370 fit diameter, Grand Prismatic hot spring at the Midway Geyser Basin in Yellowstone National Park is the largest hot spring in the park and the third largest in the

Unesco's Scientific, Educational and Cultural Organization has recognized Yellowstone National Park of the United States as a World Natural Heritage in 1978.

According to scientists, there are a number of natural hazards that are affecting the lives of a wide range of organisms on earth including humans.

The world's largest super volcano under Yellowstone National Park in Wyoming state (USA) is operating very strong with a record speed since 2004 up to now.