But in the 1920s, a huge discovery in South Asia proved that Egypt and Mesopotamia were not the only early civilizations.. In the vast Indus River plains (located in what is today Pakistan and western India), under layers of land and mounds of dirt, archaeologists discovered the remains of a 4,600 year-old city.
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A zirconia crown is a popular type of all-ceramic crown which is worn to improve the appearance of a tooth which has become stained or disfigured over the years.irconia is a type of crystal which is long lasting and indestructible. Plus there is no fear about the body rejecting zirconia or displaying an allergic reaction to it.