The invention of irrigation systems & plows (30 jan 3100 ano antes da era comum – 30 jan 2334 ano antes da era comum)
Descrição:
The Sumerians needed a stable food supply so they invented plows and irrigation systems. Irrigation systems are very important and are used many years later as well. Irrigation systems made sure that there was always a steady supply of water. Plows also were a very very important invention that prepared the soil.Adicionado na linha do tempo:
Data:
30 jan 3100 ano antes da era comum
30 jan 2334 ano antes da era comum
~ 766 years