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
Journey to the Centre of the Earth (album) Wakeman wished to make an album that told a story with its music, something that he had been inspired to do so since his father took him to see a performance of the symphonic fairy tale "Peter and the Wolf" by Sergei Prokofiev which features a narrator telling the story and an orchestra illustrating the action. Wakeman had wanted to do an orchestral rock piece based on the 1864 science fiction novel "Journey to the Centre of the Earth" by Jules Verne as early as November 1971, but he put the project on hold until he had finished recording "The