Road or pavement surfaces made from rigid material such as concrete, have cracks provided to allow for thermal expansion, and differential movement.
In other words tree roots and the earth's crust move around where ever they want to if one of the squares that is separated by cracks is damaged and cracks all we have to do is replace that one square instead of the whole sidewalk... its kind of like the square carpet idea... if you spill some thing on one square of the carpet you only need to replace that square instead of the whole room of carpet.
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