Final answer:
The Pantheon in Rome is primarily constructed from concrete and brick-faced concrete, showcasing Roman innovation in construction materials.
Explanation:
The Pantheon in Rome, constructed in 126 CE, is primarily made of concrete and brick-faced concrete, not solid marble. The concrete used by the Romans was a crucial innovation that allowed them to build large, durable structures like the Pantheon efficiently. The structure features a dome made with scoria, a lightweight volcanic rock, at its topmost layer, showcasing the Romans' advanced engineering skills.
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