Exposed rock at the Grand Canyon in Arizona, USA, represent nearly 2 billion years of geologic time.
Because its very tall and unique
The call it the grand canyon because it is a canyon that is grand.
It was named the Grand Canyon because it is truly grand.
No state is in the Grand Canyon. The Grand Canyon is in Northwestern Arizona.
The Ordovician period and the Silurian period
the grand canyon
grand canyon, Arizona
a Grand Canyon is nothing but a big erosion.........
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The grand canyon is grand