IRON.
-
Iron AND sulfur. Sulfur lowers the melting point of of both iron and nickel.
"...The Earth's core consists mostly of iron and nickel and potentially smaller amounts of lighter elements such as sulfur and oxygen. ..."
http://www.space.com/54-earth-history-co…
"...The Earth's core consists mostly of iron and nickel and potentially smaller amounts of lighter elements such as sulfur and oxygen. ..."
http://www.space.com/54-earth-history-co…
-
It is mainly iron, but contains a lot of other metals, particularly heavier ones. The center stays hot because of the uranium and thorium, as well as others, there.
-
Iron!
-
Iron
-
Fe- Iron