If carbon is buried in sediments faster than it is introduced to the atmosphere, oxygen levels will increase. Pyrite is comprised of iron and sulfur, but in the presence of oxygen, pyrite's iron combines with oxygen and becomes iron oxide, also known as rust and the sulfur forms sulfuric acid. Pyrite burial may have acted as the dominant oxygen source before carbon burial did. The dissolved iron was oxidized from a soluble form to an insoluble one, which then precipitated out of the oceans in those vivid red the color of rust layers that we see today and are called banded iron formations ""BIFs""which became an oxygen sink and kept atmospheric oxygen low.
Far less ore needs to be melted to get an equivalent amount of iron. BIFs online check dating sites the source of virtually all iron ore that humans have mined. Life processes almost certainly performed the initial work of refining iron, and humans easily finished the job billions of years later.
Copper was not refined by life processes, and copper ore takes twice as much energy to refine as iron ore does. When BIF deposition ended about 2.
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