Heat created in this chamber (or in a firebox close by) is contained there and so builds up to high temperatures. The ceramic ware undergoes the firing and cooling process. While clay can be fired in an open fire and does not require a kiln, kilns must be used to attain high temperatures.
The Colorado Plateau, a series of flat lands, gorges, mountains and valleys, extends south into Arizona, and covers most of northern half of the state. The Black Mesa, Painted Desert, and Monument Valley in northeastern Arizona are some of the plateau's most interesting areas. Scattered tree-covered ranges of the Rocky Mountains wind through the Plateau, including the Black, San Francisco and White Mountains. Humphreys Peak is the highest point at 12,633 ft.
Tallest Mountain Range in Arizona. The tallest of the peaks, Humphrey, soars to an elevation of over 12,600 feet. From a hundred miles away, you can see the San Francisco Peaks rising high above the pine forests below. The landmark icon backdrop of Flagstaff is comprised of three main peaks, Humphrey, Agassis and Fremont.