Grand canyon is a steep sided canyon formed by Colorado river.
probably a few minutes.
Actually, my cousin dug it with her friend when she was four because she ran down there from the Midwest during the night and dug it up with an old plastic beach shovel and a wagon, then ran back home in the morning.
About 5 to 6 million years
6 million years
The Grand Canyon has been excavated by the Colorado River, about 17 million years ago.
Millions of years
Google can answer thay
It has been forming since the beginning of time. It shapes itself almost daily. The Colorado River helps it along.
Seventeen lakh years
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