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Earthworks: Mounds, Walls, and Excavations Earthwork is a structure made from earth. They often were built in the layers of some carefully selected materials: sand, clay, soil, and gravel that were packed down for withstanding erosion. The known fact that earthworks lasted for years is a proof of the careful construction. There’re three basic kinds of prehistoric earthworks : walls, mounds, as well as excavations. Earthwork generally involves loosening, removal & handling of the earth quantities in the construction process. The earthworks are done to provide the level terrace and "bench", with even and longitudinal slope, in which camber and drainage are built. Earthwork is generally the costly operation in road construction, and often accounting for half of the construction costs. Principal activities in the earthworks are: The excavation that includes leveling, cut and crossbill, U-cut or borrows excavation; Measuring & calculation of volumes; F