Why are the pyramids at Giza so astonishing?

It was the most impressive pyramid ever built in ancient times, not only because of its impressive (original) height of 146.7 meters but because of its design–the only eight-sided pyramid in Egypt–and its mind-bending precision.

The grand structures were built between 2589 BC and 2504 BC. How they were built has been a source of debate. The pyramids are part of the Giza Necropolis that also houses the Great Sphinx, smaller pyramids for queens and several complexes for the workers. Historians agree there was an immense amount of labor involved; technical ingenuity and skill that went into the pyramids helped the structures remain standing today.

Explanation:

Have a good day

faulty parallelism is a grammar construction where there is no balance in the parts of a sentence they have a similar meaning but the grammar structure is not equivalent.

the correct version of this faulty parallelism in the sentence is:

jefferson wrote the declaration of independence, and he was the nation's third president.

the problem with the first version is that the sentence:

"jefferson was both the writer of the declaration of independence"

presents jefferson as both a subject and an agent for the verb "write" because if he was "the writer" then the declaration of independence was written by him, besides that fact, the sentence presents a dependent clause.

while the second sentence:

he was the nation's third president.

presents a basic subject+verb+object structure

so, to give a proper balance to the structure, or better said, to give a parallel structure, we must write a basic s+v+o structure in both sentences:

jefferson wrote the declaration of independence, and he was the nation third president.