Roman Empire:3 paragraph essay on Roman Engineering.

Roman Engineering

The ancient Romans were skilled engineers and have left lasting contributions in this field. The Romans built a great network of roads connecting cities throughout their empire. They also built aqueducts and bridges using arches for support. The Roman arch design was by far the most important innovation of their time. The arch, however, would have been useless without the discovery of concrete. The Romans had many other such discoveries that would make their engineering skills known throughout the world. The Romans discovered many things that would aid the construction of their great civilization. The Romans discovered that a particular mixture of volcanic rock rubble and water could be used to create very strong…show more content…

These roads were so well built that some of them are still in use by modern travelers. Romans knew that the shortest distance between two points is a straight line and built their roads incredibly straight, stretching for miles without a single turn. The use of stone in building roads enabled people to travel during inclement weather while dirt roads may remain too muddy to travel upon for many days after a hard rain. The Ancient Romans also knew of a road building technique that escapes the builders of modern roads in states such as Florida. This technique is known as crowning, this involves making the center of the roads higher than the sides, with a gradual slope to allow water to run off the sides instead of collecting in the middle. By the time the great Roman Empire fell, the Roman Army had built roads connecting all of their empire to Rome. One of Roman Engineering’s greatest accomplishments was the use of the arch. The arch shape is very strong, able to support great amounts of weight. This allowed Romans to build massive structures that would stand for many centuries. The Romans adapted the arch design to fit many purposes. The barrel vault is merely an elongated arch; this was used for buildings tombs and sewers.

Explanation:

early human migrations are the earliest migrations and expansions of archaic and modern humans across continents and are believed to have begun approximately 2 million years ago with the out of africa migration of homo erectus. this initial migration was followed by other archaic humans including h. heidelbergensis, which lived around 500,000 years ago and was the likely ancestor of both denisovans and neanderthals. early hominids were said to have "crossed land bridges that were eventually covered in water" .

within africa, homo sapiens dispersed around the time of its speciation, roughly 300,000 years ago.the "recent african origin" paradigm suggests that the anatomically modern humans outside of africa descend from a population of homo sapiens migrating from east africa roughly 70,000 years ago and spreading along the southern coast of asia and to oceania before 50,000 years ago. modern humans spread across europe about 40,000 years ago.

the migrating modern human populations are known to have interbred with local varieties of archaic humans, so that contemporary human populations are descended in small part (below 10% contribution) from regional varieties of archaic humans.

after the last glacial maximum, north eurasian populations migrated to the americas about 20,000 years ago. northern eurasia was peopled after 12,000 years ago, in the beginning holocene. arctic canada and greenland were reached by the paleo-eskimo expansion around 4,000 years ago. finally, polynesia was peopled after 2,000 years ago, by the austronesian expansion.

d. islands off the coast of newfoundland