Alluvium are deposits of earth, sand, gravel, and other transported matter, made by rivers, floods, or other causes, upon land not permanently submerged beneath the waters of lakes or seas. They are often found covering a pediment. Research Alluvium
In physical geography, a pediment is a broad, gently sloping rock surface that extends outwards from the abrupt foot of a mountain. Pediments are found in arid and semi-arid regions and are usually covered with a layer of alluvium. Research Pediment
In architecture an acroterium (or acroterion) is a ornamental small pedestal or block, used for statues or other ornaments, and placed on the apex and at the basal angles of a pediment. Acroteria are also sometimes placed upon the gables in Gothicarchitecture. Research Acroterium
In architecture a pediment was originally, in classical architecture, the triangular space forming the gable of a simple roof. It subsequently came to mean a similar form used as a decoration over porticoes, doors, windows, etc.; and also, a rounded or broken frontal having a similar position and use. Research Pediment
In architecture a tympanum is a recessed face of a pediment within the frame made by the upper and lower cornices, being usually a triangular space or table. The term is also applied to the space within an arch, and above a lintel or a subordinate arch, spanning the opening below the arch. Research Tympanum
 
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