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USGS CMG InfoBank: Center of Continents

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Comment: 02:12 - 02:44 (00:32)
Source: Annenberg/CPB Resources - Earth Revealed - 7. Mountain Building
Keywords: continent, craton, shield, "Canadian Shield", erosion, "North American Continent", "ice sheet", flatland, soil, "sedimentary rock", crust

Our transcription: In general, the centers of continents consist of stable regions of very old crust.
These regions called "cratons" or shields are deeply eroded, mostly low lying, and level.
One of the world's largest cratons lies in the middle of the North American Continent, a great rolling flatland.
To the north, this flatland has been stripped bare of much soil and sedimentary cover by past ice sheets.

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