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Ancient Egypt Building theory

I have a a theory amd want to know if it's plossable that the reason the ancient Egyptians could work and move the big slabs of granite and diorite is because thousands of years ago the stones were lighter and softer, then became harder and heavier over time. Something that just crossed my mind thinking that it came from lava then could keep cooling. I know little to nothing at all about geology and wondering if this is something possible