Fossil fuel is a general term for buried combustible geologic deposits of organic materials, formed from decayed plants and animals that have been converted to crude oil, coal, natural gas, or heavy oils by exposure to heat and pressure in the earth's crust over hundreds of millions of years.
Currently there are 10 Active Army Divisions. They are the 1st Armored Division, 1st Cavalry Division, 1st Infantry Division, 2nd Infantry Division, 3rd Infantry Division, 4th Infantry Division, 10th Mountain Division, 25th Infantry Division, 82nd Airborne Division, and the 101st Airborne Division. Currently there are 10 Active Army Divisions. They are the 1st Armored Division, 1st Cavalry Division, 1st Infantry Division, 2nd Infantry Division, 3rd Infantry Division, 4th Infantry Division, 10th Mountain Division, 25th Infantry Division, 82nd Airborne Division, and the 101st Airborne Division. Minor edit?
During the Civil War, the war in which formed the first large true armies in United States history, divisions were formed primarily to support Army corps, and were usually numbered as 1st, 2nd, and 3rd Division of the pertaining corps.