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Grand Canyon Tours is located in the northwest of Arizona,the Colorado River after millions of years of erosion and the formation of colorful,cliff steep.In 1979 the Grand Canyon was included in the World Heritage Site.In many non-authoritative version of the world's seven natural wonders list has the name of the Grand Canyon.Currently managed by the American Grand Canyon National Park.
Grand Canyon total length of 446 km,the average depth of 1200 meters,width from 0.5 km to 29 km range.When the Colorado Plateau was uplifted,the Colorado River and its tributaries cut layers of sedimentary rocks,forming a Grand Canyon.Nearly two billion years of geological history of history.
In 1540,a man named García López de Cárdenas first discovered the Grand Canyon.In the 1870s,US Army Major John Wesely Powell led the first scientific expedition to the Grand Canyon.Powell described the sedimentary rocks in the valley as"a book in a giant novel."However,the American Indians had settled on the walls of the canyon.
The details of the cause of the canyon are still controversial.According to geologist Wayne Lenny,"geologists are still unable to determine the exact age of the canyon and alluvial details of the process."On the formation of the Grand Canyon,there is no authoritative theory.
The glacier rocks on the cliffs of the Grand Canyon have a great span of time,both Vishnu Schiston,located at the bottom of Inner Gorge 2 billion years ago,and Kaibab Limestone,which was formed 230 million years ago,Located on shore).When the initial continental coastline of the North America continued to move forward or backward,many of the strata were deposited in warm shallow sea,coastal beaches,or swamps.But there are exceptions,including Cococino Sandstone in the form of dunes in the desert,and parts of the Supai rock formations.
The Grand Canyon is so deep that its rock formations(mostly below the sea level)are so high that it may be due to the elevation of nearly 1,500 to 3,000 meters in the Colorado Plateau about 65 million years ago.This elevation has increased the inclination of the Colorado River and its tributaries,thus speeding up its flow and enhancing its ability to cut rock.
The Colorado River Basin(the Grand Canyon is part of it)has a history of 40 million years,but the history of the Grand Canyon itself may be less than six million years(most of the erosion occurred in the last two million years).The result of all these eruptions is-to create one of the most complete geological treasures on earth.
During the ice age,the relatively humid climate increased the total water volume of the ancient Colorado River system,thus speeding down the river.
530 million years ago,the Gulf of California(Gulf of California)was opened,making the ancient Colorado River bed position reduced.This change directly leads to an increase in the proportion of undercutting.From then on to 1.2 million years ago,the ancient Colorado cut to the depth of the current and almost the same.Now the stepped rock wall is caused by differential erosion.
Grand Canyon total length of 446 km,the average depth of 1200 meters,width from 0.5 km to 29 km range.When the Colorado Plateau was uplifted,the Colorado River and its tributaries cut layers of sedimentary rocks,forming a Grand Canyon.Nearly two billion years of geological history of history.
In 1540,a man named García López de Cárdenas first discovered the Grand Canyon.In the 1870s,US Army Major John Wesely Powell led the first scientific expedition to the Grand Canyon.Powell described the sedimentary rocks in the valley as"a book in a giant novel."However,the American Indians had settled on the walls of the canyon.
The details of the cause of the canyon are still controversial.According to geologist Wayne Lenny,"geologists are still unable to determine the exact age of the canyon and alluvial details of the process."On the formation of the Grand Canyon,there is no authoritative theory.
The glacier rocks on the cliffs of the Grand Canyon have a great span of time,both Vishnu Schiston,located at the bottom of Inner Gorge 2 billion years ago,and Kaibab Limestone,which was formed 230 million years ago,Located on shore).When the initial continental coastline of the North America continued to move forward or backward,many of the strata were deposited in warm shallow sea,coastal beaches,or swamps.But there are exceptions,including Cococino Sandstone in the form of dunes in the desert,and parts of the Supai rock formations.
The Grand Canyon is so deep that its rock formations(mostly below the sea level)are so high that it may be due to the elevation of nearly 1,500 to 3,000 meters in the Colorado Plateau about 65 million years ago.This elevation has increased the inclination of the Colorado River and its tributaries,thus speeding up its flow and enhancing its ability to cut rock.
The Colorado River Basin(the Grand Canyon is part of it)has a history of 40 million years,but the history of the Grand Canyon itself may be less than six million years(most of the erosion occurred in the last two million years).The result of all these eruptions is-to create one of the most complete geological treasures on earth.
During the ice age,the relatively humid climate increased the total water volume of the ancient Colorado River system,thus speeding down the river.
530 million years ago,the Gulf of California(Gulf of California)was opened,making the ancient Colorado River bed position reduced.This change directly leads to an increase in the proportion of undercutting.From then on to 1.2 million years ago,the ancient Colorado cut to the depth of the current and almost the same.Now the stepped rock wall is caused by differential erosion.
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