The Grand Canyon is one of the most iconic natural landmarks in the United States. It was formed over millions of years as the Colorado River cut through layers of rock, creating a vast and colorful landscape that attracts millions of visitors annually. <br>
What is the main idea of the passage?
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A
The Grand Canyon is a popular tourist destination.
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B
The Grand Canyon was created by the Colorado River over millions of years.
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C
The Grand Canyon is the largest canyon in the world.
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D
The Grand Canyon is a colorful and scenic location.