Answer:
At its peak, the Roman Empire stretched from Great Britain to Egypt and served tens of millions of people. Supporting that many people, and erecting the cities to house them, took massive amounts of stone, wood and other building materials. To feed their empire's ambitions, the Romans looked far beyond their Mediterranean homeland, researchers know.
Answer:
The major contribution the Romans made to the mortar recipe was the introduction of volcanic Italian sand (also known as “pozzolana”). The Roman builders who used pozzolana rather than ordinary sand noticed that their mortar was incredibly strong and durable.
