I think if I am not mistaken it would be the Chernobyl nuclear power plant meltdown in 1986
A. Price Supports, they support a price by preventing it from falling below a certain level.
They can only settle near oasis areas.
The invention of the wheel by the Sumerians revolutionized the transportation. Wagons could be used to carry heavy loads. The Tigris and Euphrates rivers made transport of goods easy and economical. Riverboats were used to transport goods for trade. Strong currents moved the boats downstream, but because of the current they could travel in one direction only. The boats had to be dismantled after the trip downstream. The Mesopotamians used three types of boats: wooden boats with a triangular sail, the turnip or Guffa boat which was shaped like a tub, made of reeds and covered with skin, and the kalakku which was a raft of timbers supported by inflated animal skins.
The president is always top adviser, therefore he is the Head of State of and the Head of the Government of the United States.
