A blast furnace is a special type of furnace. They are used to make iron from ore. Blast furnaces are very large. They can be up to 60 metres (200 ft) tall and 15 metres (49 ft) in diameter.
Jonesborough, Tennessee. Jonesborough (historically also Jonesboro) is a town in, and the county seat of, Washington County, Tennessee, in the southeastern United States. The population was 5,975 at the 2010 census. It is Tennessee's oldest town.
Jonesboro, Georgia. Jonesboro is a city in Clayton County, Georgia, United States. The population was 4,724 as of the 2010 census. The city is the county seat of Clayton County. The city's name was originally spelled Jonesborough.