All that pressure keeps the metal in the inner core in solid form, despite its extremely high temperature. Recent scientific studies lead experts to believe that Earth's inner core is approximately 10,800Âº F â or about the same temperature as the surface of the Sun!
The New York City Police Department (NYPD) is the largest police department in the United States, with 32,284 officers as of 2009, and serving the combined populations of the Bronx, Brooklyn, Manhattan, Queens and Staten Island.
It was not until the 1830s that the idea of a centralized municipal police department first emerged in the United States. In 1838, the city of Boston established the first American police force, followed by New York City in 1845, Albany, NY and Chicago in 1851, New Orleans and Cincinnati in 1853, Philadelphia in 1855, and Newark, NJ and Baltimore in 1857 (Harring 1983, Lundman 1980; Lynch 1984). By the 1880s all major U.S. cities had municipal police forces in place.