Irrigation of crops led to salinization of the soil, Sumer was located on a flat plain that provided no natural barriers to invasion, and the land became too swampy to grow adequate crops.
I believe that it is sapien
Answer:
Oil
Explanation:
When overproduction occurred, it create a situation when the stock of the products far outnumbered the amount of people who are wiling to buy it. As a response, sellers started to reduce the price of the oil in order to make consumers more interested to buy it.
This caused a massive fall in oil price during the 1930s. Before the over production, the cost of oil at that time was around $ 1.88 / Barrel. After the overproduction, it became around 65 cents per barrel .
They do this because back then, a lot of things happened in ancient Greece. So because so many things happen, they have to carefully study the events and place them in a category or order in order to make sense.<span />
