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USGS CMG InfoBank: Impact Craters

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Comment: 07:05 - 07:56 (00:51)
Source: Annenberg/CPB Resources - Earth Revealed - 2. The Restless Planet
Keywords: "impact crater", meteorite

Our transcription: The most ancient landscapes in our Solar System still bear the scars caused by the violent impact of these objects as they were swept up by the orbiting planets.
Indeed, impact craters are a dominant feature on the surface of most bodies in the Solar System.
When meteorites slam into our planet, they travel at speeds between 11 and 70 kilometers per second.
Virtually in an instant, the underlying crust will be shattered to a depth of several kilometers and heated to temperatures as high as 15,000 degrees.
The resulting material is a mix of pulverized debris in black melted rock fragments.

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