quinta-feira, 17 de outubro de 2013
terça-feira, 15 de outubro de 2013
How Grand Canyon was made?
The Grand Canyon is a steep-sided canyon carved by the Colorado River in the state of Arizona, EUA. It is 446 km long, up to 29 km wide and attains a depth of over a 1800 meters.
Nearly two billion years of the Earth's geological history has 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.
______________________
Source: http://en.wikipedia.org/wiki/Grand_Canyon
Nearly two billion years of the Earth's geological history has 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.
______________________
Source: http://en.wikipedia.org/wiki/Grand_Canyon
Subscrever:
Mensagens (Atom)