Answer:
Steppe nomads would invade the settled communities to take control of pasture lands. Settled communities were in the fear of new or next invasion. The nomad's trade was not related to the gain but related to the goods provided themselves that they don't have that time Nomads were from two different cultures and districts.
Nomads speak a Turkic language. There were many nomads group who traveled on the silk road.
It is called social stratification. The idea of social stratification is frequently utilized and deciphered diversely inside particular hypotheses. In human science, for instance, advocates of activity hypothesis have recommended that social stratification is ordinarily found in created social orders, wherein a predominance chain of command might be fundamental with a specific end goal to keep up social request and give a steady social structure. Supposed clash hypotheses, for example, Marxism, point to the detachment of assets and absence of social versatility found in stratified social orders.
Ocean warming provides a good example of a potential positive feedback mechanism.
I would say that carbon dating is technically the most efficient because it is scientifically proven that a certain amount of carbon atoms will degrade after an organism is dead for a certain amount of time.