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Perhaps the weakest naturally occurring solid to exhibit ductile flow is glacial ice.
By contrast, at depths greater than about 10 kilometers (6 miles), where temperatures are high, rock deforms by ductile flow and folding.
Compressional stresses associ- ated with convergent plate boundaries tend to shorten and thicken Earth's crust by folding, flowing, and fault- ing, whereas tensional stresses along divergent plate boundaries tend to lengthen rock bodies by displacement along faults in the upper crust and by ductile flow at depth.
Shearing, often associated with transform plate boundaries, tends to produce fault zones in the upper crust and ductile flow at depth.
Silly Putty provides a good analogy: If pulled apart quickly, Silly Putty tends to break, whereas if pulled apart slowly, it tends to stretch (ductile flow) without breaking.
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