is a steep-sided canyon carved by the Colorado River in the United States in the state of Arizona. It is contained within and managed by Grand Canyon National Park, the Hualapai Tribal Nation, and the Havasupai Tribe. 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 (6,000 feet or 1,800 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. While the specific geologic processes and timing that formed the Grand Canyon are the subject of debate by geologists, recent evidence suggests that the Colorado River established its course through the canyon at least 17 million years ago. Since that time, the Colorado River continued to erode and form the canyon to its present-day configuration.
For thousands of years, the area has been continuously inhabited by Native Americans who built settlements within the canyon and its many caves. The Pueblo people considered the Grand Canyon ("Ongtupqa" in Hopi language) a holy site and made pilgrimages to it. The first European known to have viewed the Grand Canyon was García López de Cárdenas from Spain, who arrived in 1540.
Come visit #Rwanda and get to know why it was called the land of thousand hills. Its natural beauty has attracted many tourists as some come for #gorilla tracking and others more interested in visiting the genocide sites. It is surely a peaceful country that will make you feel at home.Sabinyo Mountain in Rwanda.
Cassini WAC RGB view taken on 2012-05-02. Stray sunlight is entering the camera optics, causing the glare. Saturn's crescent was overexposed in the source images.
Distance to Enceladus: 105 000 km
Distance to Saturn: 341 000 km
Enceladus phase angle: 160 deg
Credit: NASA/JPL/Space Science Institute
Acknowledgement: Gordon Ugarkovik
#NASA #Space #Saturn #Enceladus #Moon #Planet #Cassini #JPL #Astronomy
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