What was the main problem that Roman aqueducts were designed to solve for growing cities?

The need for a steady supply of fresh water

The frequent flooding of rivers near urban areas

The difficulty of transporting stone for building

The lack of defensive barriers against enemies

What was a key advantage of the new building material, concrete, that Roman engineers developed?

It was lighter and easier to work with than heavy stone.

It was more expensive and showed a city's great wealth.

It could only be found in quarries near the city of Rome.

It was a natural material that required no mixing.

providing a large, reliable supply of clean water for citizens and public baths.

offering a fast transportation route for small boats carrying goods into the city.

creating a water barrier that made the cities much easier to defend from attack.

irrigating large farms that were planted within the city's protective walls.

They helped Romans effectively manage and unify their vast territory.

They used up all of the empire's stone and lumber resources.

They caused most Roman citizens to become engineers or builders.

They isolated cities from one another to prevent the spread of disease.