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Suppose a major impact blasted out rock from a 200-km-diameter crater that was, on average, 2...

Suppose a major impact blasted out rock from a 200-km-diameter crater that was, on average, 2 km deep. If all that material became dust that settled out evenly over the entire surface of the Earth, how thick a layer would it form?

The layer of dust would be about ____ cm thick.

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