What were some of the theories of how the Egyptian pyramids were built? I know about the one about placing logs under the stones to move them into place, but what are some other theories? Will there be back fire to those theories like if the logs were placed under the stone blocks they might sink into the sand?
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Most probably sledges rather than log rollers.
The problem with rollers is that you need extremely high compressive strength, so they don't get crushed, and very smooth flat strong roads for them to roll along.
There is a tomb painting of a statue being dragged along on a wooden sledge with a lot of people pulling on ropes and a couple of workers pouring jars in front of the runners. Because of the way friction scales with contact area this is quite a good way of moving large masses over fairly rough ground.