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If a large (10 km) asteroid or comet were to impact earth, it would likely result in ______.

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Answer:

If the comet is 10 kilometers across or larger (that is, if the impact carries an energy of more than about 100 million megatons), the resulting global environmental damage will be so extensive that it will lead to a mass extinction, in which most life forms die.

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User Piotr Leniartek
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