why is the core on the earth predominantly made of iron??? :/?

Answer 1

it eventually became solid, not molten the Earth's outer core is molten. The melting point of a substance is a function of both temperature and pressure. The temperature of the core is high enough to melt nickel and iron on the surface of the earth where the pressure is relatively low. On the other hand, the pressure at the core of the earth is greater and therefore the melting point is also greater... so great that it remains a solid.

Answer 2

As the earth was forming most of the heavier materials came together due to their gravitational pull on each. Since iron was the heaviest it settled into what became our core. The other lighter metals and elements were drawn again by gravity toward the center. Due to the extreme pressure of all this material the core eventually became molten.

Answer 3

same reason wood floats on water when metel does not, density.

when earth was a young ball of lava the iron which is more dense than the sourounding materials, sank toward the center and lower density materials then at the core rose to the surface. this process is known as diffirentiation.