WORLD CIVILIZATION

Detailed explanation-1: -Roman concrete consisted of a mixture of a white powder known as slaked lime, small particles and rock fragments called tephra ejected by volcanic eruptions, and water.

Detailed explanation-2: -Another difference is that material used to build the entertainment structures. The roman amphitheaters were built out of marble and the modern sports stadiums are built out of metal and concrete.

Detailed explanation-3: -Romans made concrete by mixing volcanic ash with lime and seawater to make a mortar, and then incorporating into that mortar chunks of volcanic rock, the “aggregate” in the concrete.

Detailed explanation-4: -Roman concrete, also called opus caementicium, was used in construction in ancient Rome.