What is the term that describes something of a large city?

Large cities are known by the name of Metropolis. This term though, can also be used to refer to the most important city of greek colonies.

Hope it helped,

BioTeacher101

the technology changed agriculture in an impacting manner since many people left the field work by a cellular or other technological appliances

it depends on which society you are referring to. many civilization performed rituals so the gods would with their growing season but the most well known is that of the aztecs. they would make sacrifices, usually animals, but sometimes humans as well.