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 Trust Centre Earth Trust Centre is open to school groups and the general public for special events. Earth Trust Centre Earth Trust Centre, formerly known as Project Timescape, is Earth Trust's visitor and education centre near the Wittenham Clumps, Little Wittenham, Oxfordshire, England. The centre's aim is to educate and engage people in their local landscape and inspire them to take action to protect it. It includes a café, the Fison Barn and the Timescape Exhibition. Visitors can learn about the archaeology of the Wittenham Clumps, geology of the South Oxfordshire area, wildlife on the Little Wittenham Nature Reserve, the Trust's conservation