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Chip sealing is a form of treatment used to surface roads. A thin base of hot tar or asphalt is distributed evenly over the surface to be sealed, and then embedded with finely graded aggregate like small, crushed rock using a chip spreader. Heavy pneumatic rollers are then used to smooth the surface and help adhere the rock to the tar, creating a paved surface. Sometimes the surface can be additionally sealed with a top layer, called a fog seal or enrichment.