<P> The flow of heat from Earth 's interior to the surface is estimated at 47 terawatts ( TW ) and comes from two main sources in roughly equal amounts : the radiogenic heat produced by the radioactive decay of isotopes in the mantle and crust , and the primordial heat left over from the formation of the Earth . </P>
<P> The flow of heat from Earth 's interior to the surface is estimated at 47 terawatts ( TW ) and comes from two main sources in roughly equal amounts : the radiogenic heat produced by the radioactive decay of isotopes in the mantle and crust , and the primordial heat left over from the formation of the Earth . </P>
how does heat from earth 's interior reach the surface
how does heat from earth 's interior reach the surface
radioactive decay of isotopes in the mantle and crust primordial heat left over from the formation of the Earth
radioactive decay of isotopes in the mantle and crust primordial heat left over from the formation of the Earth