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USGS CMG InfoBank: Rocks Fold

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Comment: 07:33 - 08:03 (00:30)
Source: Annenberg/CPB Resources - Earth Revealed - 8. Earth's Structures
Keywords: structure, "James Sadd", rock, heat, pressure, deformation, fold

Our transcription: We usually think of rocks as being very hard and brittle.
They break when a force, such as the blow of a hammer, exceeds the strength of the rock itself.
But if rocks are very hot or under great pressure, or if they're exposed to stress very gradually over a long period of time, a rather surprising type of deformation takes place.
The rocks can actually bend or flow forming a geologic structure called a "fold."

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