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BODEEE
It is not known if the Grand Canyon is the oldest canyon in the world. The exact date is not known, however, it has been said that the canyon is at least 5-6 million years old.
I don't know who you think "they" are, but humans did not create the Grand Canyon.
yes, they do.
in the lowest layers of rock
Vishnu Schist
in the lowest layers of rock
Not hardly. The oldest rocks at the bottom of the Grand Canyon are around 2 billion years old. The oldest rock discovered on Earth of terrestrial origin is around 4.28 billion years old.
The Vishnu schist basement rock layer at the bottom of the Grand Canyon is roughly 1.8 billion years old.
By studying the geological evidence.
The Grand Canyon is 5~6 million years old. However, the oldest exposed rocks in the Grand Canyon are approximately 2 billion years old.Source: U.S. National Parks Services As many as 17,000.000 years.
The Grand Canyon existed millions of years before the Pyramids of Giza were built. The Pyramids were considered a "tourist" destination at least since the 300s BCE. The Grand Canyon has only been one since about 1885. So take your pick on which site is the "oldest" tourist site.
It isn't a monument, but a national park. A monument is something made by man, but the Grand Canyon is natural by nature.