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
The Ends of the Earth (play) Tarragon Theatre in Toronto, with Stephen Ouimette and Keith Knight in the lead roles, and Panych again directing. The Ends of the Earth (play) The Ends of the Earth is a 1992 play by Canadian playwright Morris Panych. It tells the story of two men, Frank and Walker, each of whom is convinced that the other is following him. Despite their best efforts at running away from each other, the two men repeatedly find themselves in the same places. "The Ends of the Earth" premiered at the Arts Club Theatre in Vancouver in 1992, in a production directed by Panych,