1. What is corbeling?
2. Which civilizations used this building technique?
3. What are the limitations of corbeling?
4. What shape were pre-Columbian temples?

Another early method for creating openings in walls and covering space is corbeling, in which rows or layers of stone are laid with the end of each row projecting beyond the row beneath, progressing until opposing layers almost meet and can then be capped with a stone that rests across the tops of both layers