Melanoma is a type of cancer that begins in melanocytes (cells that make the pigment melanin). Below are photos of melanoma that formed on the skin. Melanoma can also start in the eye, the intestines, or other areas of the body with pigmented tissues. Asymmetry: The shape of one half does not match the other half. 2  Border that is irregular: The edges are often ragged, notched, or blurred in outline. 3  The pigment may spread into the surrounding skin. 4  Color that is uneven: Shades of black, brown, and tan may be present.
Grand Canyon. This article is about the canyon in the southwestern United States. For other Grand Canyons, see Grand Canyon (disambiguation). The Grand Canyon (Hopi: Ongtupqa; Yavapai: Wi:kaÊ¼i:la, Navajo: TsÃ©kooh Hatsoh, Spanish: Gran CaÃ±Ã³n) is a steep-sided canyon carved by the Colorado River in the U.S. state of Arizona in North America.
President Theodore Roosevelt was a major proponent of preservation of the Grand Canyon area, and visited it on numerous occasions to hunt and enjoy the scenery. The Grand Canyon is 277 miles (446 km) long, up to 18 miles (29 km) wide and attains a depth of over a mile (6,093 feet or 1,857 meters). Nearly two billion years of Earth's geological history have been exposed as the Colorado River and its tributaries cut their channels through layer after layer of rock while the Colorado Plateau was uplifted.