Small gaps are left between cemented roads to avoid damage due to:

thermal expansion of gases

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thermal expansion of solids

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thermal expansion of liquids

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anomalous expansion

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Solution

The correct option is B thermal expansion of solids
During hot days, when the roads gets heated up, the cement expands and cracks due to the principle called thermal expansion of solids. In order to avoid accidents in such cases, a small gap is left between cemented roads.

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The thermal expansion of solids ___ .

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