The Library will be CLOSED Sunday, Monday & Tuesday December 24, 25 & 26, 2017 for Christmas. | La Biblioteca estará CERRADA el domingo, lunes y martes 24, 25 y 26 de diciembre de 2017 para la Navidad.
How is a bridge built? Cement is mixed with water and rocks to make concrete. The concrete is poured into holes and into blocks that are stacked to make a bridge. Once fences and lights are added to the bridge, cars can drive across it.