What made metals form into large veins in Earth’s crust?
In: Planetary Science
Heat and cooling for some of it, metals tend to melt and solidify at the same temperature, so as the rocks cool all the same metals turn from liquid to solid at the same time and form veins of metal. In addition iron has a unique history, iron deposits are largely found in what are called banded iron formations. These are the result of something called cyanobacteria on the early Earth producing large amounts of oxygen which bonded with the iron dissolved in the oceans creating iron oxide which the fell to the bottom of the oceans and created sedimentary layers of iron ore which are now the largest source of iron ore mined today. https://youtu.be/Zky6GdH1uLM
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