7. for what purpose were the pyramids built?
a. as temples devoted to the egyptian gods and goddesses**
b. as barracks for the egyptian armies
c. as tombs for the pharaohs
d. as natural barriers to keep out enemies

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The answer is C.
The ancient Egyptians built pyramids as tombs for the pharaohs and their queens. The pharaohs wereburied in pyramids of many different shapes and sizes from before the beginning of the Old Kingdom to the end of the Middle Kingdom. 
-from Google

Answer/// geometric period, archaic period,and classical period; geometric period is usually dated from 1000bcthe archaic and classical are 336bc to323bc;

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