We derive our primary estimate of the temperature of the deep earth from the melting behavior of iron at ultrahigh pressures. We know that the earth's core depths from 2,886 kilometers to the center at 6,371 kilometers (1,794 to 3,960 miles), is predominantly iron, with some contaminants.
Greater Cleveland-Akron ranks 16th for population, largest metro area in Ohio. CLEVELAND, Ohio - Although the eight-county Cleveland-Akron metro area lost an estimated 54,000 people from 2000 through 2009, it is still the largest metro area in Ohio, and the 16th largest nationally. Here are the biggest combined metropolitan areas in Ohio, along with their national ranks and populations. 16: Cleveland/Akron/Elyria, 2,891,988
Dayton (pronounced /deÉªtn/) is the 6th largest city in the U.S. state of Ohio and the county seat of Montgomery County, the fifth most populous county in the state. The population was 141,527 at the 2010 census. The Dayton Metropolitan Statistical Area had a population of 841,502 in the 2010 census. As of the 2010 census, Dayton is the fourth largest metropolitan area in Ohio and the 61st largest metropolitan area in the United States. The Dayton-Springfield-Greenville Combined Statistical Area had a population of 1,072,891 in 2010 and is the 43rd largest combined statistical area in the United States.