PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY
Archaeological research. Researcher examining a sample of rock through a light microscope (view of rock is seen at left). The rock is from the Step Pyramid at Saqqara in Egypt. The pyramid was made from sandstone and limestone rock, and was built in the 27th century BC (over 4600 years ago) for the Ancient Egyptian Pharaoh Djoser.
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