What is the approximate length of time preserved in Grand Canyon rocks?
A) 10,000 years
B) 100,000 years
C) 1 million years
D) 1 billion years
E) 10 billion years

Name: What is the approximate length of time preserved in Grand Canyon rocks? A) 10,000 years B) 100,000 years C) 1 million years D) 1 billion years E) 10 billion years
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The Grand Canyon's rock layers preserve nearly 2 billion years of Earth's geological history, with the oldest rocks at the bottom dating back approximately 1.8 billion years.

What Is the Approximate Length of Time Preserved in Grand