Abundance of the chemical elements in the Sun and outer planets is similar to that in the universe. Due to solar heating, the elements of Earth and the inner rocky planets of the Solar System have undergone an additional depletion of volatile hydrogen, helium, neon, nitrogen, and carbon (which volatilizes as methane). The crust, mantle, and core of the Earth show evidence of chemical segregation plus some sequestration by density. Lighter silicates of aluminum are found in the crust, with more magnesium silicate in the mantle, while metallic iron and nickel compose the core. The abundance of elements in specialized environments, such as atmospheres, or
Earth-Two series original run. The story continued in "Adventure Comics" #460- 465, which featured the death of the Earth-Two Batman. "Mr and Mrs Superman", a feature in "Superman Family" (1974–1982), featured stories of the adventures of married Superman and Lois Lane of Earth-Two. These stories were set at a time in which the Superman of Earth-Two was at a similar age to the then-present-day Superman of Earth-One. In the 1980s, DC published "All-Star Squadron" which covered the war time history of various superheroes during World War II. "Infinity, Inc.", a group made up of the children and heirs of the Justice