There have been many hypotheses about the Egyptian pyramid construction techniques. The construction techniques seem to have developed over time; the earliest pyramids were built in different ways than later ones. Most of the construction hypotheses are based on the idea that their huge stones were moved from a quarry and dragged and lifted into place. Disagreements center on the method by which the stones were conveyed and placed, after being carved using copper chisels to carve them out of the quarry stone. A recent hypothesis claims that the building blocks were manufactured in-place from a kind of limestone concrete which is also what
construction Iowa City believe.