Formal should be the answer. It seems most appropriate.
During whose reign are you talking about?
Answer:
An interesting fact is that the Egyptions purposely left no trace of evidence on how they built the pyramids. However, a study shows that the Egyptions may have used a technique where they wet the sand in front of a machine which was built to pull heavy objects, such as the heavy stones they used.
I believe the answer is: <span>They used steel plows and other new forms of technology.
Prior to this invention, the farmers only rely on the buffalo's step or manual hooes to process the field and left the part where the soil composition is too hard to process. This of course resulted in lower amount of production that the farmers obtain per area of their farms.</span>