What Is the Most Compelling Piece of Evidence That Suggests

question 7

Multiple Choice

What is the most compelling piece of evidence that suggests that the dinosaurs were made extinct by the impact of an asteroid 65 million years ago?

• A) a layer of sediment laid down at that time which is littered with dinosaur fossils
• B) dinosaur fossils are found in rock layers older than 65 million years but not younger than 65 million years
• C) a layer of sediment laid down at that time which is rich in the element Iridium (Ir), an element common in asteroids but less common on the Earth
• D) the crater from this impact can still be seen in the deserts of Arizona

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