The Pyramids were used as Tombs for their dead Pharoh. The Pharoh would be buried with all his most treasured belongings, Slaves and a Statue of Anubis to help him on his journey to the afterlife.
Hope this helps :P
Pyramids
Only the Egyptians.
to hide it and to keep it safe
Mummies, jewelry and all of the pharaohs belongings.
Giza
Pyramids
Well,yes because where else would they put the mummy?
Only the Egyptians.
to hide it and to keep it safe
because they believed in afterlife so they built the pyramids to put the dead kings in to keep them safe. In terms of grammar, both are acceptable. However, I would recommend using "Egyptians built pyramids" because implicit in the usage of the present perfect (the "have done something" tense) is that the action has continued to the present, which is not the case as concerns Egyptians building pyramids.
The ancient Egyptians built the pyramids for pharaohs in the afterlife.
The Egyptians built the pyramids as buril places for the pharoahs.
The ancient egyptians build pyramids for the Egyptian pharoahs and kings.
Egyptians
The Egyptians thought of the Pharaoh as a god.
Mummies, jewelry and all of the pharaohs belongings.
They built strong pyramids because the Egyptians kept valuable items inside them and also put people and MUMMIES I think.