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What is thought to have caused the mass extinction at the end of the Cretaceous Period?
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What is thought to have caused the mass extinction at the end of the Cretaceous Period?

User NiharikaMoola
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It was believed that a asteroid hit the Earth (specifically Mexico) when the asteroid hit it caused a freezing darkness due to dust and debris being kicked up by the asteroid . The dust and debris blocked the sunlight causing a temperature drop.
User LucaA
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