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Sumerians developed art that was largely reflective of their religious beliefs. Some artistic archeological finds depict flora and fauna of the region. The Sumerian art medium of choice was clay which was abundant in the region, but statues made from stone have also been unearthed.
One of the main things that brought an increase in income and growth in the GNP for the United States during the twenties was "stock market speculation," since during this time--known as the "roaring 20s"--there was a great deal of stock market investment, which (temporarily) spurred growth.
It was a religious movement that happened in 16th century within western Christianity.
Islamic scholars expertly gathered data and ordered it so that people could easily understand and reference information through various texts. They also summarized many Greek and Roman writings, compiling encyclopedias. Rather than being a subject in its own right, medicine was part of medieval Islamic culture.
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Beginning with the top-most layer (most recent) is necessary so as not to disturb or destroy fragile remains and the only real method. One couldn't start at the bottom and work their way up!
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