Slaves occupied the lowest social class.
If you ever need help with ancient Egypt let me know, I have a whole essay on it.
Answer: it was petrified wood that was used and mixed with the sand and water which turned it into a hard stone type substance
Explanation: was used in the stone age
The Coriolis effect causes winds to move in a "circular" pattern, due mostly to the spinning of Earth on its axis. This allows were certain weather patters to be predictable.
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The change I see in modern day farming and farming in ancient civilization is, Now we have machines to help us farm but back then they didn't so people would have to pick up each crop 1 by 1 by 1. That would take hours on hours to get enough to feed a small village. It wasn't until 1892 that John Froelich invented the tractor.
Hope this helps with your question.