Yes
Iron
No. It is made from iron found in the earth.
You can find the most Iron and nickel in the earth's inner and outer core.
There is no part of the earth's crust that is mostly composed of just iron. However the rocks composing the oceanic crust (basalt and gabro for example) are enriched in iron and magnesium minerals when compared to the rocks forming the continental crust. In terms of the whole Earth, the core is enriched in iron with an estimate that it is composed of approximately 85% iron.
You will find Earth crystals the same place you will find Iron ore. Sometimes even in the rock.
5150km
Molten iron is primarily found in the outer core of the Earth, which is a layer of liquid iron and nickel that surrounds the solid inner core. The high temperatures and pressures in the outer core keep the iron in a liquid state.
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outer core