Question

What are the differences between Modern cement and ancient cement?

Answer 1

Ancient cement	Modern cement
It was developed by the Romans during the Roman empire.	It was developed by a British scientist, John Smeaton.
It was prepared by mixing volcanic ash in moistened lime.	It is made up of materials like lime \[\ce{(CaO)}\], clay, and silica, along with some other oxides of aluminium, iron, magnesium, and gypsum \[\ce{(CaSO4, 2H2O)}\].