[aruanan]

He concluded that the crust was depleted of gold, platinum, and nickel and suggests that all these iron-loving elements were pulled into Earth's iron-rich core while its surface was still an ocean of molten magma.

It's surface was never an ocean of molten magma or it wouldn't still be outgassing millions of tons of methane and helium every year.

[verum ago]

It's surface was never an ocean of molten magma or it wouldn't still be outgassing millions of tons of methane and helium every year.

why not? the earth has a huge volume that probably couldn't all degass-- especially since gases dissolve better under pressure like that deep under the surface