What Is the K-T Boundary

question 5

Multiple Choice

What is the K-T boundary?

• A) a layer of dark sediment in the geological record formed at the same time humans learned to use fire
• B) a boundary between rocks containing the oldest life and older rocks that contained no life
• C) a boundary between the Earth's crust and the molten rock beneath it
• D) a layer of dark sediment in the geological record separating the Cretaceous and Tertiary periods of Earth's history

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