Grand canyondelicatearch

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Information about Grand canyondelicatearch

Published on April 16, 2013

Author: Nicko7771

Source: slideshare.net

Grand CanyonFrom Wikipedia, the free encyclopediaThis article is about the canyon in the southwestern United States. For other GrandCanyons, see Grand Canyon (disambiguation).The Grand Canyon is a very colorful, steep-sided gorge, carved by the ColoradoRiver in the U.S. state of Arizona. It is largely contained within the Grand CanyonNational Park — one of the first national parks in the United States. PresidentTheodore Roosevelt was a major proponent of conservation of the Grand Canyonarea, and visited on numerous occasions to hunt and enjoy the scenery. Christmas Day 2006, South RimThe canyon, created by the Colorado River over about 6 million years, is 277 miles(446 km) long, ranges in width from 4 to 18 miles (6.4 to 24 kilometers), and attainsa depth of more than a mile (1.6 km). Nearly two billion years of the Earths historyhave been exposed as the Colorado River and its tributaries cut their channelsthrough layer after layer of rock while the Colorado Plateau was uplifted.During prehistory, the area was inhabited by Native Americans who built settlementswithin the canyon and its many caves. The first European known to have viewed theGrand Canyon was García López de Cárdenas from Spain, who arrived in 1540.[1]The Grand Canyon was largely unknown until after the U.S. Civil War. In 1869,Major John Wesley Powell, a one-armed Civil War veteran with a thirst for scienceand adventure, made the first recorded journey through the canyon on the ColoradoRiver. He accomplished this trek with nine men in four small wooden boats, thoughonly six men completed the journey. Powell referred to the sedimentary rock unitsexposed in the canyon as "leaves in a great story book".

Delicate ArchFrom Wikipedia, the free encyclopediaDelicate Arch is a freestanding natural arch located in Arches National Park nearMoab, Utah, USA.It is the most widely-recognized landmark in Arches National Park and is depictedon both Utah license plates and a postage stamp commemorating Utahs centennialanniversary of statehood in 1996. The Olympic torch relay for the 2002 WinterOlympics passed through the arch. Delicate ArchHistory Because of its distinctive shape, the arch was known as "the Chaps" and "theSchoolmarms Bloomers" by local cowboys. It was given its current name by FrankBeckwith, leader of the Arches National Monument Scientific Expedition, whoexplored the area in the winter of 1933-1934. (The story that the names of DelicateArch and Landscape Arch were inadvertently exchanged due to a signage mixup bythe National Park Service is false.)The arch played no part in the original designation of the area as a U.S. NationalMonument in 1929, and was not included within the original boundaries; it wasadded when the monument was enlarged in 1938. In the 1950s, the National ParkService investigated the possibility of applying a clear plastic coating to the arch toprotect it from further erosion and eventual destruction. The idea was ultimatelyabandoned as impractical and contrary to NPS principles.

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