A student researching the Grand Canyon has taken the following notes:
• The Grand Canyon is 277 miles long and up to 18 miles wide • The Colorado River carved the canyon over millions of years • Rock layers expose nearly two billion years of Earth's geological history • The canyon attracts approximately 6 million visitors annually • Native American tribes have inhabited the region for thousands of years
The student wants to emphasize the canyon's geological significance. Which choice most effectively uses relevant information from the notes?
The Grand Canyon stretches 277 miles long and reaches up to 18 miles wide.
The Colorado River carved the Grand Canyon over millions of years, exposing rock layers that reveal nearly two billion years of Earth's geological history.
The Grand Canyon attracts approximately 6 million visitors annually.
Native American tribes have inhabited the Grand Canyon region for thousands of years.
Correct Answer: B
Choice B. Millions of years of carving exposing 2 billion years of history show geological significance.