as humans developed agriculture, they were able to stop following herds of animals and build towns and cities.
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The main element of the neolithic revolution was the invention of agriculture. This meant people could build homes and stay in the same place all year instead of following game. River valleys tended to be the most fertile places.
Water is not an element. The element that is most present in the atmosphere is Nitrogen at about 70% (Oxygen is about 20%). I don't know about the most common element in the earth's crust though. I'd say that the most common element overall is Carbon (since all life is carbon based)
Tye did not use an element but a compound made from an element - namely Antimony(III) sulfide, Sb2S3.
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Thorium
The element you are thinking of is HG which is Mercury. Another name for Mercury other than hydro-argyros is hydragyrum. Have A Nice Day!