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

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?

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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.
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User LucaA
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