[TOEFL iBT] Factual Information Trap Dissection | AceThePrep

TOEFL iBTReadingFactual Information

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Passage: 'The architectural triumph of the Roman Pantheon lies in its massive unreinforced concrete dome spanning 43.3 meters. To prevent structural collapse under its own colossal deadweight, Roman engineers progressively reduced the dome's thickness from 6.4 meters at the base to 1.2 meters around the central oculus. Furthermore, they graded the aggregate materials, utilizing dense basalt tuff at the foundation and porous, lightweight pumice near the summit.'

According to the passage, how did Roman engineers reduce the deadweight of the Pantheon's dome?

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