Question: how giza pyramids were built?
Answer: Researchers in Egypt discovered a 4,500-year-old ramp system used to haul alabaster stones out of a quarry, and reports have suggested that it could provide clues as to how Egyptians built the pyramids. ... The ramp system dates at least as far back as the reign of Pharaoh Khufu, who built the Great Pyramid at Giza.