By the time we see them they are fully developed but how did they get to that point and what causes them in the first place.
In: Engineering
Water gets into cracks in roads and expands when it freezes, loosening asphalt. When it happens enough, pieces break loose. Since ice is often associated with snow, plows scraping large metal plow blades along the road makes the loose pavement worse, further loosening loose sections, even popping chunks out
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