what kind of rock is the sphinx made of
The rock stratum out of which the Sphinx has been made varies from a soft yellowish to a hard grey limestone. The massive body is made of the softer stone, which is easily eroded, while the head is formed of the harder stone.
The rock of Uluru is very old. After carefully studying Uluru rock structure, scientists found out that it was laid down as sea sediment about 500 million years ago. The rock of Uluru is a big block of the ancient mountains that used to be in this area.Rainwater flowing down the mountains eroded the sand and rock they were made from. Large pieces of rock and sand fell on to the surrounding plain. Millions of years later the whole area was covered by sea.oday Uluru's above-ground layers are about 2.5 km thick and its under-ground part is about 6 km thick. See Animation. The Uluru rock is pitted with holes, cracks and caves. Some rock layers that make up Uluru, are softer than others, and wear away more quickly.