Italian architecture

The Romans as Engineers How does technological change transform architectural structures? How do technological advances allow the Roman Empire to expand? How does concrete allow the Roman Empire to replicate its values throughout a far-flung empire? Etruscans The Etruscans gave the Romans: the arch the vault advances in land-drainage, irrigation, and sewer design the atrium house the rectangular temple plan Greeks The Greeks gave the Romans: the gridiron town plan the peristyle form (columns all around) But the Romans invented concrete. The Romans built upon the engineering developments of the Greeks and Etruscans (central Italy, 750-200 BCE). Why do the keystone and voussoir matter? Why are these two terms so significant? Why is wood necessary? What are the limitations?