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SODIS is a method of purifying water using clear plastic bottles and natural sunlight.
The UV rays produced by the natural light kills any bacteria, virus, or other harmful substances.
Apparently Sumerian society was thought to be comprised of four social classes: Nobles, commoners, clients and slaves. The Nobles, who were at the top of Sumerian society, consisted of priests, warriors, and of course, the ruling family. Commoners were your average citizen of Sumer at the time. They were the farmers, and craftsmen, and blacksmiths (very, very crude form of blacksmithing). Clients and slaves were the lowest. The slaves had no rights whatsoever. Clients, however could do more and even buy their freedom.
This affected society by trying to create a perfect utopia it caused jealousy towards the higher class and bitterness to others, causing many revolts and outbreaks. The fact the laws were quiet strict, helped fuel that anger and hatred.
Continental drift is the geological phenomenon in which continents move. These movements at speeds of a few centimeters per year can actually be measured since the advent of satellite geodesy. The movement of continents is caused by plate tectonics.
Alfred Wegener noted at the beginning of the 20th century that the edges of some continents (particularly South America and Africa) are similar in shape, concluding that the continents were connected and separated before. The problem was that it was not known how huge land masses could move across the Earth's surface. Such a movement requires enormous power and it was not known where it came from.
Later it was known that, according to plate tectonics, the continents move as a result of convection currents in the mantle. They slowly move away from each other, bump into each other, slide under each other, or rub against each other. This causes various surface phenomena, such as earthquakes, volcanism, and slow changes, such as subsidence, mountain building and the displacement of continents.
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