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It is commonly agreed by geologists that the Grand Canyon was once an ocean. This is proven by the presence of sea fossils all throughout the canyon.

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10y ago
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5mo ago

No, the Grand Canyon was not once an ocean. It was formed by the Colorado River cutting through layers of rock over millions of years. The rocks in the Grand Canyon are ancient, with some being over 1.7 billion years old.

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Q: Was the Grand Canyon once an ocean?
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