ocr: The basic building materials of Teotihuacan were of local origin. Outcrops of porous volcanic rock in the valley were quarried, and the stone was crushed and mixed with lime and earth to provide a kind of moisture- resistant concrete that was used as the foundation for floors and walls. The same material was used for roofing; wooden posts spaced at intervals bore much of the weight of the roof. Walls were made of stone and mortar or of sunbaked adobe brick. Floors and wall surfaces were then usually finished with highly polished plaster. What kinds of people lived in Teoti- huacan? Religious p ...
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