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.
Ryan Ozawa has it right - the summit benchmark of Mauna Kea reads 13,796 feet, although some more recent satellite measurements have indicated 13,802 feet. That's unquestionably the highest natural point in Hawaii. The enclosure for the Gemini Observatory telescope located a few hundred feet from the summit actually reaches higher than the summit, so the highest manmade point in Hawaii would be the top of Gemini's dome, at somewhere above 13,820 feet.