Most solids, like most liquids, expand when heated and contract when cooled. To allow for this, roads, sidewalks, and railroad tracks are constructed with spacings between sections so that they can expand during the hot weather.If roads, sidewalks, and railroad tracks were not constructed with spacings between sections,

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Most solids, like most liquids, expand when heated and contract when cooled. To allow for this, roads, sidewalks, and railroad tracks are constructed with spacings between sections so that they can expand during the hot weather.<br>If roads, sidewalks, and railroad tracks were not constructed with spacings between sections,