I think it's cold rolled steel because this type of steel as closer dimensional tolerances and wider range of surface finishes. But I'm not completely certain this is what you're looking for.
Hope this helps :)
Answer:
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Physical Weathering
This especially happens with granitic rocks as they were cooling, like at Yosemite National Park. Freeze-thaw: When water freezes, it expands. If moisture seeps into cracks before winter, it can then freeze, driving the rocks apart.