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
Return to the Centre of the Earth Guy Nadon. The concert was accompanied by giant screens and a light and firework display. Wakeman has stated that this show was the highlight of his career. All music, narration, and lyrics written and produced by Rick Wakeman; all odd-numbered tracks narrated by Patrick Stewart. Credits are adapted from the album's CD liner notes. Return to the Centre of the Earth Return to the Centre of the Earth is a studio album by the English keyboardist Rick Wakeman, released on 15 March 1999 on EMI Classics. The album is a sequel to his 1974 concept album "Journey to the Centre