Grand Canyon at twilight.

© RicardMN Photography

© RicardMN Photography

Grand Canyon at twilight.

Grand Canyon is a steep-sided canyon carved by the Colorado River in the United States in the state of Arizona.
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 / 1,800 metres) Nearly two billion years of the 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 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.

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Bridalveil Fall in Yosemite Valley

© RicardMN Photography

© RicardMN Photography

Bridalveil Fall is one of the most prominent waterfalls in the Yosemite Valley in California, seen yearly by millions of visitors to Yosemite National Park. The waterfall is 188 metres (617 ft) in height and flows year round.

The Ahwahneechee tribe believed that Bridalveil Fall was home to a vengeful spirit named Pohono which guarded the entrance to the valley, and that those leaving the valley must not look directly into the waterfall lest they be cursed. They also believed that inhaling the mist of Bridalveil Fall would improve one’s chances of marriage.

Yosemite National Park is a United States National Park spanning eastern portions of Tuolumne, Mariposa and Madera counties in the central eastern portion of the U.S. state of California. Yosemite is one of the largest and least fragmented habitat blocks in the Sierra Nevada, and the park supports a diversity of plants and animals. The park has an elevation range from 2,127 to 13,114 feet (648 to 3,997 m) and contains five major vegetation zones: chaparral/oak woodland, lower montane forest, upper montane forest, subalpine zone, and alpine.

The geology of the Yosemite area is characterized by granitic rocks and remnants of older rock. About 10 million years ago, the Sierra Nevada was uplifted and then tilted to form its relatively gentle western slopes and the more dramatic eastern slopes. The uplift increased the steepness of stream and river beds, resulting in formation of deep, narrow canyons. About 1 million years ago, snow and ice accumulated, forming glaciers at the higher alpine meadows that moved down the river valleys. Ice thickness in Yosemite Valley may have reached 4,000 feet (1,200 m) during the early glacial episode. The downslope movement of the ice masses cut and sculpted the U-shaped valley. (Description from Wikipedia)

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