The Classical WorldTechnology Roman concrete c. 150 BCEMajor Volcanic-ash concrete lets Romans build domes, harbors and structures that still stand. ▲ MattersSaveShareTrace roots Longest chain: The Big Bang → First stars ignite → Supernovae seed heavy elements → The Sun forms → Earth forms → First oceans → First life → Photosynthesis evolves → Great Oxidation Event → Complex cells (eukaryotes) → Multicellular life → First animals → Cambrian Explosion → First vertebrates → Jawed fish → Fish walk onto land → The amniotic egg → The Great Dying → Dinosaurs appear → Asteroid ends the dinosaurs → Early primates → Apes split from monkeys → Human line splits from chimpanzees → Walking upright → First stone tools → Genus Homo appears → Homo erectus → Control of fire → First fired clay figures → First pottery → Potter's wheel → The wheel → Spoke-wheeled chariot → Hittite Empire → Iron Age begins → Rome founded (traditional date) → Roman Republic founded → Roman concrete Community notesLoading notes… Learn more ranked by votesDocumentnews.mit.eduRiddle solved: Why was Roman concrete so durable? (MIT News) ↗Editor's pickBookJean-Pierre AdamRoman Building: Materials and Techniques ↗Editor's pickVideoSearch on YouTubewhy Roman concrete lasted ↗Editor's pick