<P> The Earth 's crust is made of approximately 5 % of heavy metals by weight , with iron comprising 95 % of this quantity . Light metals ( ~ 20 % ) and nonmetals ( ~ 75 % ) make up the other 95 % of the crust . Despite their overall scarcity , heavy metals can become concentrated in economically extractable quantities as a result of mountain building , erosion , or other geological processes . </P>
<P> The Earth 's crust is made of approximately 5 % of heavy metals by weight , with iron comprising 95 % of this quantity . Light metals ( ~ 20 % ) and nonmetals ( ~ 75 % ) make up the other 95 % of the crust . Despite their overall scarcity , heavy metals can become concentrated in economically extractable quantities as a result of mountain building , erosion , or other geological processes . </P>
which heavy metal has highest concentration in earth 's crust
which heavy metal has highest concentration in earth 's crust
iron
iron