The summer wind, came blowin' in-from across the sea. It lingered there, to touch your hair-and walk with me. All summer long, we sang a song-and then we strolled that golden sand. Two sweethearts, and the summer wind. Like painted kites, those days and nights-they went flyin' by.
Iron is a trace mineral needed to make hemoglobin, the protein needed to carry oxygen throughout the body. Hemoglobin gives red blood cells their color, and stores most of the body s iron supply. Iron is also stored in muscle tissue, and helps supply the muscles with the oxygen needed to make them contract.
However, its use only became widespread in the 14th century, when smelting furnaces (the forerunner of blast furnaces) began to replace forges. Iron ores are rocks from which metallic iron can be economically extracted. These rocks are usually found in the form of hematite (Fe2O3) or magnetite (Fe3O4). About 98% of world iron ore production is used to make iron in the form of steel.