Some examples would be the Silk trade or even their Food.
Is there a all of the above?
If not choose the one most related to the lesson (probably B,C,or A depending on the lesson)
Answer:
Over the last two centuries the dipole strength has been decreasing at a rate of about 6.3% per century. At this rate of decrease, the field would be negligible in about 1600 years. However, this strength is about average for the last 7 thousand years, and the current rate of change is not unusual.
A the southwest isnt an area that is fully populated yet due to the land layout and the weather and lack of jobs