What physical characteristic, often black on stony types, results from the rapid cooling of the outer surface layer during atmospheric passage?

Answer

Fusion crust

The fusion crust is a thin, glass-like glaze that solidifies after the outer layer of the space rock melts due to friction and then cools quickly upon deceleration.

What physical characteristic, often black on stony types, results from the rapid cooling of the outer surface layer during atmospheric passage?

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