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speed of contraction is different for 2 different material

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Yes, the bottom part of the pavement kept its warmth due to the soil, while the top part last warmth due to the wind. 

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The upper surface of the pavement lost heat to the cold wind and contracted faster than the inner surface of the pavement that’s in contact with the warm soil. Because the speed of contraction is different on both surface, the stress in the material caused the pavement to crack.

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Hint: Matter expands when heated and contracts when cooled. 

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